

If your in the US you can tell them you’ll report them to the FTC and fcc as unsolicited spam text messages that have no means to opt out. They must provide a means to stop receiving text messages per can spam act. If they refuse you report them and then they face 50k in fines per message. You also get to have federal record at least that you didn’t want the text messages. You could also file a police report. The cops may roll their eyes, but just tell them you just want something on record that the former number owner waa a shady character and want to avoid any potential legal issues in the future for having their number and getting weird calls or texts.
https://www.fcc.gov/consumers/guides/stop-unwanted-robocalls-and-texts
Login to your credit card portal and check if they have it. I noticed mine has it as a free service now.
Edit: free service with my my cc account not straight up free to everyone with no cc.