I know a guy who had same happen to him with Verizon wireless. He had cancelled the service but they kept billing him which he didn't see (I think he moved?).

I know a guy who had same happen to him with Verizon wireless. He had cancelled the service but they kept billing him which he didn't see (I think he moved?). This was when most bills were still sent in physical mails. They sent the unpaid bills to collection agency and it was a huge hassle. He still refuses to do anything with verizon wireless.