Dstv is treating me badly

I paid DSTV an amount of R129 at Pick n pay Protea Glen mall, on the 8th of August but I lost my slip. Dstv switched my services off on the 22nd of August whereas my subscription date is the 1st day of each month, I called and I was told to pay again an amount of R179 to be reconnected which I paid (bare in mind my subscription is R120) I was reconnected again. Now I am getting an SMS telling me that I should pay another R120 before the 1st of September 2022. I don't understand why should I pay three times in one month? I then cantacted them and they told me they can't see the amount I paid on the 8th of August from their system but they can see other payments, my question is why is they system picking up only certain payments. The time I paid on the 8th of August I was disconnected and after I made the payment their system automatically reconnected my TV which is proof enough that I did pay. I am now told to go to Pick and pay and ask them to reprint the slip of which I didn't get because they need me to tell them the till number before they help me and I don't remember. Why is it my fault that DSTV system decides to record certain payments and not all of them