Multichoice customer service less than pathetic

Multichoice suddenly started deducting double the debit order each month from my bank account. Instead of R874, they deducted R1805 in Feb 2018, R1578 in Mar 2018 and R1618 in April 2018. When I queried this I was told there was a "glitch" in the system around mid January and I was charged for 2 full subscriptions from then on by mistake. I was also told that I needed to get a technician out to solve my problem (as I then only had reception in one TV) , as there was a problem was on my side. I called in a technician, who could find no fault on my side, and he called Multichoice. Turned out the error was AGAIN on their side and they corrected it. So now both my TVs work. I now must pay this technician for a fault on the Multichoice side. I am also owed the excess amounts that they deducted from me in error. No-one responds to my emails to Multichoice (via the website) or to my query on their Facebook page. They just don't seem to care. And I called this morning out of desperation, only to be told that I have a credit of around R600! That's way too little, and I want a REFUND, not a credit. This company is beyond pathetic. I would really welcome any response frm them (if that is not asking too much).