Direct debit doubled premiums & inadequate service

I have a mobile contract with Telkom Mobile and have had endless problems with their service. I have had direct debits running off in the middle of the month for double my monthly premium on a fixed top up contract, and I am always in a credit. I have logged endless cases with them to no avail and the issue always resumes the next month after being informed the issue is resolved. In December 2015 they advised the issue was resolved with my Direct Debit and in January 2016 they deducted R327 for a R109 contract on the 15th . I opened two contracts for my husband and myself his cell phone contract was left in his name, he did not agree to a contract, the payments are from my bank account which I have set up when activating the contracts. When I call to the call centre all the agents have difficulty understanding the statement of account as it is confusing them due to their errors. The service I have had is pathetic and I am stuck in a 2 year obligation of terrible service and unhappiness, where are my consumer rights? When I call in, every month no one is able to assist, I have been to the branch in Centuary City Canal Walk and they cannot assist as this is a \ call centre issue\""