DSTV REFUND MY MONEY PLEASE

I am a Kazang Trader and Friday 5 June 2020, I made a mistake of paying one of my customer's DSTV more than she is supposed to pay. My customer was supposed to pay R110 and not sure if it was a finger error I added 7 by the time I looked and wanted to correct the error I did it was already a successful payment. I called Kazang and they told me because it's successful they cannot do anything I need to call DSTV. I called DSTV was told the customer need to call, my customer called and a lady forgot her name told her it's not a train smash we should not worry DSTV will refund me, we need to go to the nearest DSTV outlet. Following day we went there after standing in that long que with an old lady we were told we need to call Call Centre went home and call again. Call Centre Agent Cole said they were not supposed to send us back they were supposed to refund us we need to go back again and ask for cash refund we did again yesterday again they refuse telling us they can't do anything. I don't understand how is this difficult to refund as DSTV can see this is an error and this customer has been paying R110.DSTV please refund Kazang money because this is not my money kazang borrow me to sell and I'm short with R997 and need to pay back this money Tuesday 9 June so he can be able to give me again to trade. The customer number will be in your system you can call the lady to confirm about this I will add her account number and ID and on the cellphone field I added my cellphone number.