Service issues

Spend hour and a half at Telkom just to hear that they are overcharging me because of an outstanding balance that they fail to inform me about. I never received a statement because the email address was incorrect . I did an upgrade end of October and in November I had to cancel my contract with telkom online(the agent I spoke to never cancelled it.) This is my 3rd contract with them and my final one too . I don't know if there is a service provider out there with good customer service with data packages.