Deirdre
If you saved your confirmation number or your receipt from the payment you made to Ellis, then that is all you need.
Is this another company that is calling you?
If this is another company all you need to tell them is that you made payment to them, and they might ask you to fax them the receipt.
I would recommend placing a complaint anyway. Threatening arrest is against the law, especially since Ellis Crosby & Associates have no power to do so.
They are already under investigation for unethical collection practice, and embezzlement. They'll charge high interest on accounts, get paid --because they're threatening people, and then reselling the accounts to another company.
Place your complaint with Summer with the Attorney Generals Office and with the Better Business Bureau.
Sorry you didn't find this site sooner....
Regards-
Mike