Cancelled but still being charged

I am beyond livid now, i had called into the Telkom call centre in August 2017 for my ADSL line, which I wanted cancelled due to no connection (I mean we were offline for 3 weeks every month) the service agent said "sure no problem will request it is cancelled" a few weeks later I receive a bill, call again and go through the same process again and get the same response, this goes on until November 2017 - this is when I really became effing angry, different service agent (Dandre) asks if I completed "cancellation forms" say no was never told, she send me the forms, I complete and send back, told it will be cancelled, a few weeks later receive another effing bill, call again end up speaking to (Triselda Chetty) sent her the forms as well and she to states it will be cancelled. This morning guess what? - I RECEIVED AN EFFING BILL!!!!! I AM SO EFFING SICK OF THIS BS!!!!! THIS LINE WAS CANCELLED IN AUGUST 2017!!!!!! WHY THE EFF I AM STILL GETTING A DAMN BILL??? I WILL NOT PAY FOR YOUR CONSTANT EFF UP'S!!!!!