770-870-1070 belongs to Convergence Outsourcing, Inc in Lilburn, GA, which is outside Atlanta. When I called the number back, I got some rude witch who kept cutting me off when I tried to say anything then hung up on me.
From what I can find, this company buys so-called outstanding accounts from other collection agencies and then tries to collect on them. They do not verify the debts and most of them were never valid to start with or have already been paid in full.