Still Debiting my account after cancellation

i cancelled the purchase of the decoder from OnAir Tv. Paid a R350 cancellation fee on 01 June 2021, which I feel is a *******. the decoder was returned via courier company but I'm still being debited R179 per month. I received an sms on 27 July 2021, threatening legal action as my debit order failed. lol. Be careful of OnAir Tv. Before you commit yourself make sure you shop around for a better deal. Their phone numbers are forever busy. Their emails don't responded to and if they respond, your are always referred to customercare. Customercare will call you if you lucky. lol *******s who enrich themselves with an unfair R350 cancellation fee.