If you don’t want to get calls from sales and marketing firms, you can add your details to a list, run by the Telephone Preference Service, which makes it illegal for a company to call you for marketing purposes in the future.
The Telephone Preference Service can be contacted at:
Telephone Preference Service
www.tpsonline.org.uk After 21working days of your request it is then illegal for a sales company or company you do not associate with to call you.
Hope this helps