Game debits me incorrectly for more than a year

I am very disappointed and angry at Game stores credit division, I called into the call center back in 2018 and asked that they debit me total outstanding amount owed on my account and dont debit me again. They agreed over the phone and decided otherwise in December 2018. They have since debited me R 33.32 since Dec 2018 till March 2020. I called in and a agent advised that Game owed me the cash as I didnt have a balance owed to them. They refuse to give me back my cash they so wrongfully took from me. I refuse to pay the price for *********** staff that failed to carry out my instruction. I need someone to contact me via mail or phone asap. This is absolutely ridicules.