Debits still taking place after cancellation

I was advised in April that I will be able to cancel my 3 year contract in May 2020 without penalties but should I do it before the end of April there would penalties. Therefore the beginning of May I sent an email to head office instructing cancellation of debit order and contract. I then spoke to Trevor Schroeder Club General Manager at Randburg Bromhof asking for forms to cancel. Trevor emailed forms 4 days later. I immediately completed forms with instruction that no further debits should take place and emailed back to Trevor. 1 June I was debited again. After back and forth emails with Trevor "emails which he wrote as if he was talking to a childhood friend and NOT a client" he basically told me if I was not happy I could reverse it at my back but it would still not be cancelled until 1 last debit was paid. I asked if someone more professional could handle my query but still no response. Disgusting that its almost impossible to cancel contract and that I am treated like a dog when I try to, yet when they wanted my business I was treated like a king..