Telkom *****ing my money

I had a Telkom Mobile WiFi account. It was great. Then I moved from KZN to Free State and found out that Telkom didn't have coverage where I had moved to. I phoned and cancelled my account with Telkom for that reason. I phoned in September 2018. My bank account has been debited every month since, including November 2018. When I phone Telkom I am told that my account has been closed but they can't tell me why I am still paying for a service I can't even use.