Keep billing me when cancelled service months ago

My Telkom telephone line has been removed from my property, in 4 months ago. I went into a Telkom service centre to cancel my service, they took my number and a lady called me, she said thank it is cancelled. 2 months down the road and i am still receiving statements. They have even suspended my service. There is no Physical line at my property. I cannot speak to anyone when I call, once i was on the line for 50 min. I go back into the service centre, they will get some to call me, they do it is cancelled. but it is not. So what NOW telkom. must i wait for a lawyers letter.