RCS Game Card nightmare

I opened a Game account on 13th December 2018 and purchased an air cooler of R1199 that same day. Four days later, on the 17th December 2018, my card was hacked and all the money was used while my card was locked in a safe at home. I was not able to make any instalment payments while the investigation was underway. I phoned many times to ask RCS what I must do about the threatening collection emails and I was told to just ignore them. The investigation concluded in March 2019, the ********** purchases were cleared and a consultant informed me that I could pay an instalment of R164 per month. Yet my instalments emailed to me were over R500. How can an air cooler of R1199 have an instalment amount of R500?? With that logic I will have paid off the account in a little over 2 months. I have phoned RCS about 6 times about this problem and every time the consultant is apologetic and states that the instalment balance will be corrected. I have even spoken to a manager from RCS and she apologised and promised that she had requested for the balance to be corrected and that it would be correct the following month. Yet my September 2019 statement was still incorrect with the instalement amount of R646,86. I have been paying an instalment of R164 every month since March 2019 so I am not in arrears. I am tired of receiving rude phone calls from the RCS collection department; I am tired of receiving Correspondence emails stating that I am in arrears and I am tired of having to continuously phone RCS to explain this problem from the beginning, only to recieve empty promises that the instalment balance will be corrected. I am also tired of stressing that I might receive a bad credit record due to computer error and *********** staff. I have tried to fix this problem 6 times and I don't know what else to do. I am extremely unhappy with RCS and I feel like their service has been terrible.