Disappointed

So for over 12 years I've been a loyal customer of DSTV and have never failed to pay my account, the beginning of January 2022 I called them to cancel my account and was told that I would be required to pay R218 on the 25th which I agreed to. Over the weekend I got a message from DSTV stating that I need to pay R1207 on the 25th, I have never in over 12 years paid so much so I called in and they advised me that it was a mistake from their side and can't adjust the amount because payroll has was run already. Today is the 25th and low and behold they have deducted R1207 out of my account.