Damelin - No Service

I have paid the R36 000.00 of my studies in full in January 2020, without doing any of the courses paid for. It was such a hassle to get in touch with ANYBODY to assist with problems during the time of my course that I eventually just gave up, wasting all that money.... On the 31th March 2020 I made a payment of R3000.00 into their account by mistake. I have been trying to have the amount paid back to me since April 2020 to no avail. I have tried phoning, mailed their Customer Care on NUMEROUS occasions and even phoned Icg. Org for help. I have pulled my credit record and it shows that I have a bad credit record because of this? I am at a lost and truly hope that somebody can assist me with this problem. PLEASE HELP.