Damaged I phone 6S

At the end of December 2015 i had to upgrade 2 contracts with Vodacom. One for my wife and one for my self, Both contracts are on my name. We upgraded to the new i phone 6S. My wife had her phone for 3 weeks when the phone just shut down and couldn't be switched back on again and would not charge. I took the phone with its box to the Vodacom shop where i got the phone from. (Vodacom shop inside Three Rivers shoping centre) I explained to the technician what happened and he said that they would have to send the phone in for repairs. I booked the phone in with them and it was sent off to Vodacom repairs Cresta. The phone stayed there for about 2 weeks when i received and sms to say that its back at the Vodacom shop for collection. When i arrived at the Vodacom shop they realised that find my iphone was switched on so Cresta couldn work on it. The Vodacom tech guy didnt know how to switch find my iphone of so they sent me to Vodacom repairs center Vanderbijlpark. My wife has been sitting without a phone for 17 days already and the phone is being sent from one repairs centre to another. Vodacom Vanderbijlpark can swhich find my iphone off due to technical reasons. Assistance required