Billed and debited for cancelled lte contract

My lte contract expired in July. I still got billed for it in August and September. I have queried this and tried to have it rectified since August to date. My attempts have proven futile. Not only can i not be transferred to the relevant department as they are said not to have a direct line? Why is this? This is because they want to frustrate the living daylights out of you. Calling the call centre is a waste of time energy and airtime as they are not competent to resolve the issues. Their turn around time is nonsense and non-existent! Im fed up and have had it with Telkom!!!!!!!!!! Im still incorrectly billed to date! What does a customer need to do to get assistance. I reverse my debit orders with my bank because of incorrect billing and Telkom charges R200 for this every time. Im not winning with these people. And why on earth do they not have offices/customer service center where a customer can go to have matters resolved timeously! I'm never buying any product from these guys ever for as long as i shall live, nor will my family, nor will my friend, nor colleagues! 4 months of an unresolved issue is utter nonsense!