Payday lender trying to collect on old payday loan

I got a payday loan back on 11/18/2011 from AAFA of Colorado d/b/a Firsta American Cash Advance in Colorado Springs CO 80911. I got a loan for $500.00 with finance charge of 292.54= total payment $792.54. I was making payments for two months but due to my disability I was unable to go in a make my monthly agreement payments so I had just told the clerk via phone call to deposit my last check of 510.45 which would of been my balance. The check was deposit in my account on 2/21/2012. They had informed me that I would be paid in full with the check being deposited but never received a reciept since I had them do this over the phone. Well I just got a phone call from Advance american cash advance center of LLC d/b/a Advance American dba Advance America Cash Advance Center stating that they had bought out First American and I am still showing a balance of interest due to they didn't deposit the check in time. Can they do this? I mean I had not heard from them till May saying I owe them interest. This isn't the company i even got the loan from . If this is not legal what can I do to assure I won't get introuble or anything taking effect to my credit report.