SSDA not providing paid up letter

SSDA had been appointed as debt collector by Discovery Health to collect an outstanding amount from myself. I made a payment arrangement with them, and proceeded to make payments as agreed. The debt was paid off in totality by March this year. I came to realise, however, that the adverse listing was not removed on my credit record, as per the regulations of the Credit Information Amnesty act. I called in to the offices of SSDA on 31 October and requested a paid up letter in order to have the adverse listing removed, however, to date have not received same. I consequently also sent an email to their offices, which had not been answered.