Telkom Business is ******ing me

Telkom is a ****

I've been trying to terminate my business line for the past four months instead the debt keeps accumulating. I sent a cancelation letter, typed on a letterhead plus my ID as instructed, after settling the bill.

I have not been utilizing their line since October, paid a settlement amount that I was given by them but today I owe R5000 plus.

Can someone take me out of this ******ion please