Poor Customer service I don't recommend them to anyone

I have a problem with this people, I have sent them emails requesting my paid letter, I have called about 5 times no one is answering my calls, and no one rep**** to my emails, they handed my account to a debt collectors and it was easy for them to do that, but now that I have paid their account it's difficult to reply my email and my calls to provide me with my paid up letter