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Check your states guidelines on making payments. Generally if you are making faithful payments with no written agreement, they are not allowed to send debt off. I had this happen to me with two small debts, $150 twice for E.R. visits, the hospital sent them to AMCOL. Their customer service sucks unless you get one of the few who you know their policies. They will verbally agree to delete off credit report once payment is done in full, but will NOT do a PFD letter. Cashiers Check/Money Order is the fastest way to get it off, mine happened within 7 days.
I will PM you the contact info for a woman I spoke with who helped me, after I got in a fight with one of their "supervisors" whose answers to my legimate concerns were "I don't know." Hopefully you can get it resolved.