Debited account even after cancellation made and processed by customer service agent

Good day,

I had received a call from one of the OnAir sales reps Sthembiso Zikalala sometime in February. I was happy with what was offered up until I discussed with my children that I can't afford what wss offered as I will have to pay both Multichoice and OnAir TV supscription I then called the OnAir TV customer care centre and spoke to Comara who assisted me with the cancellation then I got a reference number and was told I should pay R200 for the courier to come fetch the decoder, I am still waiting even today for the courier to come collect the decoder which I didn't open. The thing that is concerning is that R380 was debited from my account while I had asked them not to debit and instructed my bank not to allow them debit my account yet the transaction still happened. I would like to request that I be contacted ASAP cause my account will be debited again this month which won't be nice. I am a really disappointed and frustrated client.