CANCELLATION QUERY

On the 4/04/2015 I cancelled my MTN internet subscription via e-mail, because one can never get through to the call centre (after many attempts). I received a standard e-mail of request received and nothing else. From this date onward I did not use the service at all. On the 2/05/2015 my account was debited with R 385.13. After this I sent another request to the cancellation department on the 12/05/2015 and only received a standard e-mail. Still no confirmation of the cancellation and on the 01/06/2015 my account was debited again for R 575.24 for no services used. I want my account cancelled immediately and my monies paid back. I don't believe this policy is not in line with the consumer protection act.