How do I know if a collector is allowed to add interest to my debt? I was contacted by a debt collector saying I owe $4823.60-- $849.86 from interest, $606.19 "fees/coll costs", and $3367.55 was the principal amount from the original creditor. This collector though isn't collecting on behalf of the original creditor (AT&T), their client is US Assets Management Inc., whom I supposed was attempting to collect on behalf on AT&T. I already sent and received their "validation" which was a copy of a billing statement from AT&T (cycle date 11/2009-12/2009) with the amount of $3367.55 as past due.


