not paying back the credit in the account

i am an debt review client at Edgars. i have paid my account in full but to such an extend that I am currently in excess with +- R1 500 (credit). on 20 October my debt review counsellor and I send a mail to Edgars with all relevant documents for the payback of the excess amount. until now no one from the debt review department has corresponded. i forwarded the same e-mail to accounts @ Edcon and the lady simply answered, i have forwarded the request to debt review. i want my money paid back and the letter stating my account is closed and I owe them nothing