R350 bill for 24hours usage

I got my Apple Iphone 6 29 June 2015, I was out of the country for 2 weeks, when I got back my phone still was not activated - after activation the phone simply did not go 3G so I still could not use it - on the evening of 2 August I saw the phone was showing 3G - at 18:12 I started downloading whatsapp and facebook and 2 games and I chatted with my family a bit - at 18:42 R100 airtime was GONE!!! Within 30minutes - I chatted with family until Monday 3 August and my phone got soft locked - now I get a bill for R351 rand for data used - in not even 24hours!! I can not use my phone - oh I use it to play a game - but further nothing because it does not work. This is the most dissapointing experience I have had - I will not recommend MRP mobile to any other person - and I am in good mind to take this matter to the Ombudsman. Enough is Enough!!