Cancellation

I received I call from one of the agents on the 12 of May for the Telkom contract SIM card I agreed and all went well .. on the 19 I received an sms saying an activation fee will be debited from my account I didn’t understand why because I haven’t received my simcard I called to cancel the procedure then the lady said all is well it has been cancelled .. I call again on the 24 just to make sure before my payday then they confirm that it has been cancelled they won’t debit my question was I didn’t receive any email or sms saying your application has been cancelled successfully.. then the next morning I get a bank notification that my activation fee has been debited and I took my money to go to the bank and reverse then they told me it can’t be reversed…