Since it's Alliance One, I'm assuming this is a CapOne account? They use Alliance One quite often. And, by no surprise, their CA is just as ruthless and shady as the OC. Birds of a feather. . .
I wouldn't be surprised if he calls you again, and you will need to send that do not call notice in writing, CMRRR, before he stops pestering you.
Because you did start paying them, there isn't as much incentive for the settlement. The most important questions to start, though,....What is your DOFD? What's SOL in your state? Is this account on your CR right now? Does the info on your CR match the info you know to be true regarding the account?