Repairs damaged iphone 6.

On July the 3rd 2017 my iphone 6 was taken in for assessment at a Vodacom store. The phone was fully functional and the purpose of the assessment was to check for and update the recent software as the phone was not picking up signal. After being contacted by the store to collect the phone, I found that the phone was damaged beyond repair while in the custody of the Vodacom store (I was **** to when I questioned why the phone would no longer turn on). I have tried to communicate with the store directly to resolve the matter for over 2 months now and nothing has been done about this. I am a very unhappy customer and I am appalled at the level of incompetence and disregard that has been displayed to me by Vodacom.