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They called me  too and knew my name.they said they were pro capital from uk. Can someone please give more info about these calls? is it someone trying to hack us?

"Hack"? No, you should look the word up and understand what it means. Had you done that first you would have known not to ask that question.

"gain unauthorized access to data in a system or computer."  How the hell they know your number and your name?! Many of hacked systems start with a call.

Unlike you, who plagiarized that definition without citing the source, I have taken the opportunity to actually look for more then the simplistic definition in the Merriam-Webster online dictionary.

Computer hacking refers to the practice of modifying or altering computer software and hardware to accomplish a goal that is considered to be outside of the creator’s original objective. Those individuals who engage in computer hacking activities are typically referred to as “hackers.”
The majority of hackers possess an advanced understanding of computer technology. The typical computer hacker will possess an expert level in a particular computer program and will have advanced abilities in regards to computer programming.
Unlike the majority of computer crimes which are regarded as clear cut in terms of legality issues, computer hacking is somewhat ambiguous and difficult to define. In all forms, however, computer hacking will involve some degree of infringement on the privacy of others or the damaging of a computer-based property such as web pages, software, or files.
As a result of this loaded definition, the impact of computer hacking will vary from a simple invasive procedure to an illegal extraction of confidential or personal information.

https://cyber.laws.com/hacking
Definitions of Hacking
The New Hacker’s Dictionary, a resource used to elucidate upon the art of computer hacking, has defined the practice through an assortment of definitions:
A hacker may be defined as any person who enjoys exploring the intricacies of programmable systems and how to stretch their capabilities. This definition is held in contrast to a generic computer user, who prefers to access a computer’s minimal functions;
One who programs or who enjoys programming, as opposed to those individuals who simply theorize about programming;
An individual who possesses exceptional skill regarding computer programming;
A malicious meddler who attempts to discover and subsequently tamper with sensitive information through poking around computer-based technologies. These individuals are commonly referred to as “network hackers” or “password hackers.”
Regardless of the definition, there are unwritten rules or principles that a hacker will ultimately live by. The belief that information sharing is a powerful exercise and that is the ethical duty of hackers to share their expertise through the creation of free software and through facilitating access to information and to computing resources is a fundamental code for which the majority of hackers follow. In addition, computer hacking as a practice revolves around the belief that system-cracking as a hobby or for fun is ethically okay so long as the hacker commits no vandalism, theft, or a breach of confidentiality.
Issues of Computer Hacking
Computer hacking possesses a mixed perception. Due to our reliance on computer technologies and the critical information shared on networks, the art of computer hacking has been skeptically viewed. That being said, there is also a “Robin Hood” mentality attached to the practice, where free programs or facilitated measures have been awarded to the average computer user.
The primary issue attached to computer hacking stems from an individual’s ability to access crucial or personal information that is found on a computer network. The ability to retrieve and subsequently tamper with such information will give way to the potential to commit heinous criminal acts.

Hacking
Definition - What does Hacking mean?
Hacking generally refers to unauthorized intrusion into a computer or a network. The person engaged in hacking activities is known as a hacker. This hacker may alter system or security features to accomplish a goal that differs from the original purpose of the system.

Hacking can also refer to non-malicious activities, usually involving unusual or improvised alterations to equipment or processes.

https://www.techopedia.com/definition/26361/hacking

Techopedia explains Hacking
Hackers employ a variety of techniques for hacking, including:

Vulnerability scanner: checks computers on networks for known weaknesses
Password cracking: the process of recovering passwords from data stored or transmitted by computer systems
Packet sniffer: applications that capture data packets in order to view data and passwords in transit over networks
Spoofing attack: involves websites which falsify data by mimicking legitimate sites, and they are therefore treated as trusted sites by users or other programs
Root kit: represents a set of programs which work to subvert control of an operating system from legitimate operators
Trojan horse: serves as a back door in a computer system to allow an intruder to gain access to the system later
Viruses: self-replicating programs that spread by inserting copies of themselves into other executable code files or documents
Key loggers: tools designed to record every keystroke on the affected machine for later retrieval
Certain corporations employ hackers as part of their support staff. These legitimate hackers use their skills to find flaws in the company security system, thus preventing identity theft and other computer-related crimes.

Happy reading!

"Many of hacked systems start with a call" - well, sort of. If you get a call from one of the "Your computer is sending errors to the internet" scammers and give them access to your computer, most web dwellers would not consider that a "hack."  If you let them in, the bit about 'unauthorized' goes out the window.  That is a scammer at work, not a hacker.

I got a call from this number, too. They knew my name and hung up without saying anything else, just said my name. When I try to call this number, service voice says it doesn't exist.

Also got a call from this number. Don't know that it is, but it was just after my phone blocked an unknow number call. Without leaving voice message or text message, I always classify this calls as spam. (didn't answer, so not sure)