Constant Harrassment from RCS for an account that was paid up 8 months ago

I am at a point right now where I am looking at taking legal action against RCS for their constant harassment regarding a Game account I had.

I paid up my Game account at the end of 2019, went physically into the Game store in the Pavilion shopping centre and paid the outstanding card fees that were being charged. I have a paid up letter from RCS dated 19 December 2019 yet I receive calls almost daily harassing me for payment as well as SMS reminders with an outstanding balance.

I see that they do respond to complaints on this platform so this is the last straw. If I do not receive a satisfactory response and clear confirmation that my account is paid up and they will no longer contact me then I will institute legal action against them.

I spoke to a consultant on 07-07-2020 and I made it very clear that my account is paid up and they need to stop calling me but that has not made a difference. I even asked to speak with her manager but all I got was attitude and her raising her voice at me. She did however give me his name - Vis Naidoo, and assured me that he would contact me but 3 weeks later the calls are still coming through but not from him. I received another sms this morning stating that I owe an amount of R132, last month it was R180, it's absolutely pathetic that a company as big as RCS has no clear process for updating their records and closing accounts once they have been paid up.