Billing problems and non existent customer service

Telkom’s billing department is *********** and disgusting. I have a contract with telkom for R799 a month and they have been billing me more than R800 for more than 2 years now. Every time I query it with multiple other things that will be going wrong they promise to fix it but never did. In November they double debited my account, I reversed the other R800 and logged a call twice to find out why. Instead of calling me they debited R74 rands which I also reversed. They have now cut off my service with no call from them to resolve my query.