Vodacom disappoints!!

My iphone is still under warranty and I have sent it in for repairs due to no reception / screen flashing / unable to answer calls. I had to send it in once again for the same problem but since the 1st complaint (no new handset was issued!) my phone has a small crack on the screen. Vodacom now refuses to repair the handset but expects me to pay R3500 for a new handset, this after they have a record of the SAME problem before the small crack in the screen. I am cancelling my 3 contracts with Vodacom and will move to another supplier.