It's Credit One Bank. They issue credit cards. If you're behind your account goes up their in house collections. Then after that to other collection agencies. They have many and use them all to get their money!
Its not one of credit one banks phone numbers. Not that I can find on there website anyway. It says its in Texas and credit one is in California. They xall and wont leave a messege. It might be capital one bank. I will keep looking.