Debit orders not being processed

Since changing banks,for the past 6 months,Telkom mobile has failed to process my monthly debit orders,which I have to do manually,in spite of me updating my banking details, & confirming that they have the correct information. I do not receive my monthly statement nor do I get any notification until 48hrs before they will \interrupt"my services. Numerous calls have been made with no resolution. What is the point of a customer signing a contract with debit order set up if you cannot process it? Another complaint was made last week & \""escalated\"" with ref no ***7. Today for the 2nd time in 6 months the phone service was suspended without any notification & my complaint was not resolved. Also"