First off, add yourself to the FCC's do not call list: https://www.donotcall.gov/ Once you've done that, they have 31 days to comply. There's plenty of legal entities that still will call you. If you answer, be polite, play the dope a bit to get the necessary unfortunately, ask how they got the number, then request a manager (yes, they have one, they will tell you they don't. Be polite but insist). When you get the m…
The FCC is defunct. I've been on the list for eons. Reporting is, AFAICT, a huge waste of time, and doesn't seem to change anything. You can play wack-a-mole with uBlock, but it's wack-a-mole, and poor bandaid over our government agencies not doing the job they're supposed to be doing. You'll never get them all; AFAICT recently, my own state government sold my information to private corporations.
Probably should add some context. Some bad SCOTUS rulings basically handed nearly all text message regulation to the telecom companies themselves (through the CTIA). They don't really care too much about spam if you pay them enough to do it and don't get extremely high reporting rates (especially with short codes, they will filter/blacklist toll free numbers and local numbers if you hammer carriers enough).