Very bad service

I app**** for an adsl line they told me it would be approximately R 170 per month, so the came to activate the line which was already at my home, at the end of the month I never received a bill so I went online on telkom website and told them I need a bill, I did that a few times but they never sent me a bill, and eventually switched of my Internet, I eventually got a bill for over R 2000 and then they said it's interest ect. I went to pay the bill in August and the bill was over R 2700.00 then they even charged me for the months of which the the adsl was switched off, and now they are also giving me a bad credit record and telling people that I do not pay which affected my approval for finance for buying a car. I have only received very bad service from telkom and would not recommend it to anyone.