Excessive data usage of Iphone 6

I am on a Red Vip package with Vodacom. In December 2014 I upgraded to the Apple IPhone 6. Imagine my shock when my January bill arrived at over R7000,00. R5000,00 of that was for data usage. After calling Vodacoms call centre and logging a query, I received a refund of R5000,00 for the data usage. Vodacom admitted that there was a problem with the data usage on IPhone 6's hence the refund. I went to a Vodashop who turned off some settings that were supposed to limit data usage. I damaged the phone in February and while waiting for stock used my old IPhone 5. Data usage normalized. My new phone arrived in April and lo and behold, data usage went mad again. My bills have slowly crept up from R6000,00 to this months R10000,00.<br> <br> Vodacom, you admitted that there was a problem and refunded me which I appreciated. This cannot go on anymore. I need my phone to work but am not prepared to pay for insane data charges anymore. This is a rip-off.<br> I have many friends who also have IPhone 6's and ALL have the same problem.<br> <br> How can this be sorted out?<br> <br>