DISHONEST SALES

I signed up with MTN for a data only deal, advertised online and in their books for R299. Just got hit with a R3624.3 bill and told i need to send them a copy of the contract ( which i did not receive a copy of ) so that they can pass a credit. I need to take half a morning to drive an hour to fetch a copy of my contract so that i can prove that i signed up for a contract and request a discount. Can you not just honor your advertisments. What goes on behing the scenses is not my problem, I did not sign up on a deal on the condition that i have to send you a copy of the contract that you have to request a discount. Unacceptable!!!!