No one is willing to help

Good day. I had a landline at my previous adress ( 8 Sycamore rd Amanzimtoi) I moved to Middelburg end May 2018 and cancell my landline at Telkom, galleria mall on the 1st of may. Now I keep getting emails that i am in arrears. I went to Telkom Middelburg Mall to find out whats the problem. The lady that assited me find the cancelation form online but nothing has been done to date. She gave me a dispute nr: ********** 2 and promise that this issue will be solved within 3 working days. That was on the 17th of September. Today my application for a telkom contract was declined because they show bad debt from telkom. What else must i do to get help, no one is doing their job and i sit with a bad record because of telkom.