Telkom Billing, Reference ***5

I opened a cell-phone contract for a Samsung Galaxy S6 with Telkom for R399 per month online. Some how another contract was opened, after the second cell-phone was delivered I contacted the call centre and even went to the branch at Cresta mall and the cell-phone was returned. Now every month I am getting billed for two contracts even though I returned the second cell-phone and I was assured that the billing will be fixed. it has been more than 3 months and nothing has been fixed, I have tried to call the call centre to find out when will this be fixed so far all I get are promises that the person who is handling the case will call me back. The reference is ***5.