This number 13214569871 will not stop texting me. It gives an option to reply STOP to stop and HELP for help but when I reply stop, a separate error message text me back from my phone company saying this is an invalid number. How do I stop this?

Same bulshit happened to me

Same as original post and more texts. Wondering if this is some kind of spam or hackers   I can't block the number on my phone