Outstanding Payment not allocated

I am trying to close my account with Edgars since last year September. Keep telling me there is an outstanding amount. They can't find one payment. Sent proof to them. All the cost, interest, legal fees coming with this account. Edgars collections department keeps telling me to be patient they are working on it. Today I received an email from BLake Att telling me I need to pay this amount or else. Find my payment, correct the account with all the interest and everything then I will settle it and then EDGARS can close this account.