DSTV incorrect billing

As a loyal customer of DSTV I am horrid that with my latest engagement with their billing/accounts department. I pay my DSTV subscription annually in January, however this month out of the blue I was debited R1800 odd incorrectly. After querying this with the most unhelpful agent I was told that it was an incorrect billing and that I should go to my bank to have this reversed (imagine my horror...). I was then told that it doesn't matter whether they bank had successfully cleared their funds I had to wait in excess of 20 days depending on who I bank with for the reversal as this is the DSTV process. Firstly DSTV ********ly debited our account with an incorrect amount, which could have resulted other debit orders being dishonoured and then tells me I have to wait 20 days to have my funds returned to ....shocking