Important Information Not Updated

I made Telkom aware that my bank details have changed and got confirmation for the consultant on the phone that my details have been updated.<br> <br> My details were not updated and Telkom continued to debit my inactive bank account.<br> <br> They later cut of my service because of a past due payment and I was told by a consultant and a manager that it was because of me not updating my information in time. I told them that I made the call but was told that they have no proof or record of me making the call.<br> <br> It seems like Telkom keeps records of the customer calls as it suits them. This is the worst customer service experience that I have ever dealt with,