Debit goes off but i cancelled and did not make use of your service for a whole month!!

I am starting to think rain internet service provider are one of the best con artists. Requested cancellation...did not make use of their services yet they debit R529 from my account. I was promised by one of their consultants Akhona, with an email i requested ( i have proof) that my subscribtion has been cancelled with them and there wont be any debit order on my account this month, and they still debited.