Cancellations Department - POOR SERVICE

I have been trying to cancel a number linked to my account since September 2020. They confirmed that the cancellation was processed and that I won't be charge from October onwards. Yet, here we are in January 2021 and I am still being charged for a number I don't want and have never used. I have called about 6 times to try and follow-up, was told once the lady that was processing the cancellation didn't do it properly so they had to resubmit the cancellation. Another time, I was given attitude for wanting the cancel and had to listen to someone trying to convince me not to cancel the number as it is only R65 a month. Today I phoned again, was told to hold and then eventually they dropped the call after waiting for 15 min. I am fed up and don't want to keep on paying for something I don't need or use. Can't seem to reach anyone to assist with confirming the cancellation. Horrible service!