Cancellation of Adsl

On the 28th of march 2015 I went to telkom shop key west to request that they cancel my adsl line. The lady explained to me that cancellations are subject to one months notice, so the service will be stopped on the 28th of april 2015, so she logged the cancellation request and gave me a cancellation referance number. After paying my final telkom invoice at the end of april 2015, I was suprized as I received another invoice at the end of may. I then phoned telkoms call centre and was told an investigation will be launched and the problem resolved. And I received an investagation number. The following month again I received an invoice, also stating that I was in arrears due to the fact that I was under the impression my line had been cancelled. I again visited a telkom shop, this time at four ways crossing. After explaining my problem to the lady she explained to me that her manager will resolve the problem and all costs after april will be withdrawn. This month again I received an invoice from telkom. I refuse to pay for these invoices because I no longer stay at that residence, as I moved at the <br> end of april. And all the neccesary steps where taken to cancel the account.