DStv (MultiChoice) - outrageous amount debited after contract ends.

My two year fixed contract ended in August 2019. I contacted M-choice on the 24th August at 13:02 and informed them I needed to cancel my subscription due to financial reasons. The consultant informed me that my subscription would end around the 20th September and there would be no further charges. On the 19th September I received an SMS informing me that a debit order of R2544.06 would be coming of my account. You can imagine my reaction. I called the help desk on the 19th Sep at 14:44 and told them there had better not be a debit from my account for this amount. The consultant rambled on about some previous decoder and bla, bla, bla... I said if this is not sorted out I will go onto Hello Peter and load a complaint. Well as you can imagine they debited my account with R 2544.06. Life is stressful enough without companies committing this type of abuse on people. There should be some form of repercussions for companies doing this sort of thing. If I laid a case of theft against a person for *****ing this amount of money they could face jail time... so why do companies get away with it.