A collections agency started reporting a collections account from his cell phone company. Just a few weeks ago, my brother says he had called and spoke to someone there at sprint (he has her name and number), and disputed the amount they say he owes..he didn't talk to Allied Interstate (the collection agency in question). He then made a payment, and was told by the rep at sprint that they would send him a letter. He never got such a letter, but then today we noticed Allied Interstate reporting a collections account for this same account. Help please!