Another amusing moment I had with a phone company (many years ago) was when AT&T Wireless (which, at the time, was a completely separate company from AT&T, which was a completely different company from AT&T today) moved their payment center from Los Angeles to . . . somewhere else where their slaves could be paid a lot less. They even put in a change of address with the Post Office.
Then, they didn't bother to update the computer that printed the statements with the new address on the payment coupons... For so long the forwarding address expired. So I get a check (a *long* time ago) returned as undeliverable, and at about the same time, my account is suspended for nonpayment.
I didn't even bother to call them. I just filed a complaint with the Public Utilities Commission, which a) actually has some teeth in California, and b) hates anything that might possibly be related to AT&T with great passion. Less than a week later, I get a letter informing me the account had been reactivated, and I was being given three months of free service.
At the end of the three months, I moved to a different phone company. Second stupidest phone company I ever dealt with.