Shocking service with horrible internet speed

I recently obtained an iphone 6 which I signed for on the 1st April 2015. During the month of May I then signed for a cat b100 phone. The amount for the Iphone was R639.00 per month for 24 months and the cat phone was for R249.00 for 24 months. My first bill showed and amount exceeding R639 and the cat phone was over R300. I tried to contact MTN through the useless 808 number and was subjected to a horrible tune for 1 hour. Has MTN not heard of the radio or music?. Eventually I had to drive into town to an MTN shop whereby a consultant tried to help me. Two weeks later I had to go again into town as the problem had still not been rectified properly. I was then told that the iphone is right as there was a price increase on the 15 April and MTN says ***** me I must pay even though the contracts for new iphones after the increase is still R639. The B100 will apparently be resolved and the amount should have been R249. Further more after been ********** by MTN I am now subjected to the worst internet speeds since Dial up k56 modems. Even after the strike has now ended, the speed is worse. I wish I never signed those contracts as I hate MTN and will never renew again.