9999999999

They got you info via leaks, theft or maybe your bank since the account number was referenced. But it could be from almost any vendor you paid with a check. Keep your eye on your account in case of ID theft etc.
Forward the texts to 7726 as spam. That should block the number as well.

number sent text, saying my netflix order gad been declined...who cares? I don't have netflix, nor do I want it. I blocked their number!

I was checking my bill and this number 999-999-9999 keeps showing up that I’ve been sending text and receiving them also for this number. I have no idea who it is. I went into my messages and checked times that it says I’ve texted this number and there not on person or number in my text that’s got the same time stamp. This is crazy and it’s really starting to scare me. I’ve been have all kinds of issues with my phone and my carrier . How do I find out who or what this is going on.

Called your carrier and see if you can get some answers about this.
If you google "texts from 999-999-9999" you will see quite a few people have the same question about this number showing on bills, and quite a few possible answers. The correct answer may depend on your carrier.
Nothing to be afraid of, just some sort of technology BS.

2025 & this number is still used in scams.  This is supposed to be from Koodo & a number of others in 2022 had received calls saying collect your e-transfer.