A voice/wireless provider can abuse a lot of things and get away with it now. Even if it is an obvious problem, the FCC doesn't do anything about specific complaints unless you hire an attorney to file a formal complaint. All of the wireless providers that sell cheap wireless can terminate your account and say they don't know you and there's nothing you can do. Actual telecoms that have skin in the game (Verizon, AT&T, Sprint, etc) can't do that due to there is usually a state/local regulator that can intervene.
> there is usually a state/local regulator that can intervene.
I was pretty shocked that when I complained to my state regulator about Verizon completely ignoring an issue with my business lines, I quickly got a call from a VP at Verizon grovelling and asking me what he could do for me. I said I needed my issue fixed, and then made what I thought was a crazy unrelated request- I wanted FIOS run all the way down the street to my business, and I'd been told previously that Verizon had no plans to expand FIOS in my area. Well, they fixed my issue within an hour, and within two weeks, they rolled trucks, ran the fiber down the street, and we had FIOS service up and running. They were obviously good and afraid of the state regulator.