I get spam texts almost daily. I too wish this would stop and I've tried most of the things the OP has as well. I see this as analogous to being inundated with spam email and we solved the problem for email with regulation[0] and we need to do the same for SMS. The bad news is that it is also likely to get much worse before it gets better[1].
[0] https://www.ftc.gov/business-guidance/resources/can-spam-act... [1] https://www.npr.org/2026/07/12/nx-s1-5867763/ai-artificial-i...