Worst service provider

I called the Telkom call centre several time to check when my last installment will be as I was to cancel the contract. I can’t get through to anyone, my calls got cut. Their self service option is useless because I can’t get the answers I need. There is a lot of issues with this network which I am not going to waste my breath on. You go to the branch there is a long queue and only 2 agents working, meaning you have to stand for hours only to be referred to a call centre that is not working. Telkom network services provider is the worst. I have had enough with their pathetic service, my patience has ran out I can’t tolerate this no longer. I just want someone to tell me when is my contract ending or even better how can I have this cancelled what would the penalties be?