DSTV - taking money without authorization from my bank account

I have the premium prescription on price lock that I was told in the beginning of April when I wanted to cancel my DSTV that it will end the end of May 2018 and I can only cancel it then. On the 1st of May, I got an error E16 - which they informed me that my contract ended and if I want to go on I have to pay the normal fees, I quiried why I was told that it only expires end of May when I wanted to cancel it in the beginning of April and why nobody notified me of the cancelation. I instructed them not to put me on the normal prescription that I will not be using the DSTV anmore and that I will not pay for any fees they have extra. The lady informed me that it was noted as such and that a supervisor will contact me the next day, that would have been yesterday. Today I got a notification that the price lock price when off my account, I phone DSTV and told them that I did not give them permission to take money from my account and that nobody even phoned me as yet. I also instructed her to ensure that someone does phone me today as I want my money back into my account today still, as I did not give them permission to take money out of my account. Does DSTV do this to all their clients, do they just take money out of your account even if they stop your services on their side as your contract has expired, how does this work? To me this is not exceptable.