Pay back the money

Telkom has continued to charged me for a service I did not request. They continue to debit my account and take money from me yet the extra I have been charged which = R350.00 per month for more than 3 months, has not been credited to my account. I was given a case number (***5) yet it has not been resolved. However my service is still suspended. I hold on for ages with the call centre but am getting no joy. I held on for more than five minutes and got cut off.