Frustrating DSTV customer

I am frustrated with incompetency at DSTV. I changed my DSTV account to the premium account to the price lock system. At first (Beginning of August 2019) DSTV deducted an amount over R2132 from my account and yet I had already paid my usual premium of R940. I had logged at the same time and DSTV have not yet refunded or credited our account. At the Beginning of September 2019 being on the price lock system (R809pm), You have still not yet rectified your error of August. You are have deducted an amount of R1029.26 for no reason. This is my 4th complaint and call log. I called in on the 2 September 2019 and my account has still not been refunded yet your customer service centre guaranteed that the refund happen within 7 days. This is utter *******. I am not here to service you, and for to deduct random amounts of money from my account. I have signed to a service hoping to get great service. It's upsetting that your systems are not up to date. This is ***** and costing me more each time I have lay a complaint for incompetence.