Telkom out here *****ing my money!!!!!!

Telkom keeps debiting my account more than the contractual amount that was agreed to. the scary part is that the more i reverse my funds, the more they go into my account and ***** my money!!! the worst part is that they haven't even called to find out why the debits keep getting reversed, they just keep taking money that is not due to them... iv heard people complain before but im starting to believe that accepting the contract deal was the worst thing i could have ever done!!! Telkom really is the devil that everyone describes it to be!