Caller ID says ALTISOURCE. Nationwide Credit, Inc. is a wholly owned subsidiary of ALTISOURCE. Among the services they provide are contigency collections to credit card companies.
From prior experience with Nationwide Credit, I know they will make your phone ring off the hook. They had one of my accounts with Amex about a year ago for a specfied time. When that timeframe was about to expire and Amex was about to take the account back from them, they called me as often as twice an hour in an effort to collect on the account before they lost it. As I recall, all their calls originated from phone numbers in the Atlanta area.