They spoof caller ID numbers using Voice over IP technology, for local markets to make it look like a friend or neighbor may be calling you, this is their number for the Atlanta market. They may show other markets hoping to hit one that you do business in or have relatives. Spoof caller ID usually only shows the state as the source of the call with the number. Those that are not spoofed will show the city and the state of the original call  The calls are from Convergent.  This company buys very old debt that is "out of statute".  Meaning legally it has been removed from your credit reports and it isn't as though that is a free pass not to pay debts you owe, but there are laws about whether they have the right to continue to try to collect.  These outfits seldom have the proper documentation.  Do not acknowledge the debt.  If you make an arrangement the clock is reset on the seven years and it goes back on your credit report.