Very poor service and response

I upgraded my DSTV subscription in November 2019 on with the Black Friday Deal they had @ R799 per month. After many mails going back and forth, eventually my decoder was delivered in January 2020 and the new decoder was installed couple of days after that. I had a call with a lady in Feb, confirming my new monthly fee will be R799. Since installation, my subscription stayed at R904 per month and last month went up to R919 per month. I've sent mails and put in a request via the website last week but still no reply or any action???? When will this be sorted?? How do they not pick this up on their side?