Vodacom trying to get out of device Warranty??!

My frustrations started with my (less than 11 month old!!!) iphone 6 literally just blacking out on me while on a call. Since it's going black the device has not worked again. In taking it in to the Vodacom Service Centre at the GR Mall, and the manager himself noting on the jobcard that there was no physical damage whatsoever to my device (not even a scratch!), it was sent for repairs and to my disbelief returned days later with a simple report saying \phone bent!!"In questioning the fact that my phone was still under warranty"