Damelin not refunding money after 6 months!

Due to bad service I cancelled my course with Damelin and was told I need to send my study Material back, and then they can authorize cancellation. I sent material last year August. I phoned today and on the system is shows, they only received the note of acknowledgement for the receiving of study material, yesterday - 6 months later. Damelin cannot confirm when this will be signed of by a manager, to go to refunds department so that they can refund me. As I cancelled my course, I will not get all my money back for contract break, yet it can take 1 process by Damelin 6 months, where my contract stated they pay 90 days after receiving material. The main reason for cancellation was due to bad service, and the bad service just continued after that.