Multichoice Failing to calculate contract terms

I took a 24 month contract in 2021 which includes decoder and price lock subscription, contract ended November 2023 then from Dec everything went back to normal price but to my surprise they still added R70 to my monthly premium, I called on the 15th of Dec (Ref ***8-i364) spoke to consultant who said the R70 is for one point installation and according to his system I will pay this R70 for next 2 months (Dec and Jan), I said no that cannot be possible because installation was activated same time when contract was activated so should end same time, he also confirmed yes he can see it was activated same day so doesn't understand why they still charging it while contract ended but he will send request to finance department to help me, they should call me latest Monday the 18th of Jan but they never call me.

I called again on the 19th spoke to another guy who confirmed he canceled it but because invoice has already sent out, I will pay for it now in Dec but in Jan I will have a credit of R70, now when I'm checking statement instead of canceling R70, he canceled R7 meaning there is still additional R63 into my account. Can someone please cancel that one point installation fee because it was activated same day when contract start therefore should be canceled same date when contract end and please credit me the R70 you already took on the 20th of Dec. There is no way subscription contract can end in 24 months as agreed but installation still taking additional 2 months.

Customer no ***8

Thanks