DSTV upgraded me to Compact without my consent and billed me for it.

on 29th December, I received a sms from DSTV alerting me that I will be charged R479. I am currently on the lowest Package (Easy View), which costs R30pm. I was extremely surprised to find out that I was going to be billed R479. when I called the Call Center, I was advised that there was a pending upgrade on my account. I disputed this and they agreed to cancel the upgrade. On 3rd January, I got an incontact message from my bank showing that I had been charged R479 by DSTV. When I called to query, they advised that even though I had cancelled the upgrade, the debit order was already initiated by the bank and that is why I was billed. I am now sitting in a position where I was short of funds for my current debit orders, since I had not budgeted for such a large amount to be debited by DSTv. This has caused me to miss an insurance payment, as well as being charged R115 in bank fees because of that failed transaction. This is not the first time that DSTV has done this. it's probably the 5th or 6th time.