Incorrectly overcharged

I renewed my fixed contract with DSTV in March this year 2025 with a price lock of R600 for 24 months and now it has been breached. From March, April, May 2025, they have been over charging me, and I have been calling them to resolved this to no vain and I have not upgraded anything on my package is still the same package that I have been using all along. They say that I have added Netflix on my package and that is not true. When I asked them to cancel, they say they can't I need to cancel myself. When I call Netflix, they cannot cancel because they do not have my details. On the 28th of May 2025 they deducted 900 and some rands and they couldn't find it and on the 29th of May 2025 I transferred 600.00 as per my price lock agreement but on 01/06/2025 they disconnected my dstv because of the Netflix arrears'. I spent almost R 250.00 on airtime trying to resolve the issue with no luck. I have to pay another R 500.00 for my kids to watch the tv. I want this query to be resolved this month ASAP and be credited for the 3 months were they over charged and my airtime money that I have been using. I have not reached the stage where I want my contract to be cancelled since there is a breach from their side but I’m getting there slowly….!!!