Vodacom contract cancellation nightmare

Cancelling a Vodacom contract is a nightmare. I called their cancellation department on the 08/02/2021, received an sms "You will receive an sms & email with your exact cancellation or conversion date. until such time, your contract cancellation is not confirmed." debit order went off end of February 2021 as it was supposed to be my last month. To my surprise, airtime was loaded onto my line. I called again the same department on the 10/03/2021 and was promised that my cancellation has been submitted. Received the same sms as before. Called again on the 14/04/2021, received the same stupid sms again. Now it is the 02/05/2021, I still have not received my cancellation email, more airtime has been loaded onto my line. I reversed their debit order as I should not and will not pay for a contract that I do not want and should have been cancelled already. I called again today 02/05/2021 to get the same automated sms as before. Vodacom is the worst ISP ever... Does it take 3 months to cancel a contract? I am so irritated and regret taking the contract in the first place.