Don't buy from Orange!

I bought 2 Sony M4 phones from Orange. The phones were delivered within the specified time. We started using the phones but one had a problem with the microphone. I called the call center and arranged for the return. I personally delivered the problematic phone to Orange's offices on 11 August 2015. The gentlemen who assisted me with the documentation assured me that it wouldn't take longer than 10 days to sort out. When I enquired after 10 working days, they said the phone was sent to the repair center on 12 August but it could take up to 30 days to repair. I told them that I needed the phone by mid September because of travel arrangements and they assured me that it would be ready for collection on 12 September. I've had to phone them a number of times now to enquire about my phone. Today the call center agent eventually gave me the number for the repair center to enquire with them about where my phone is. WHAT?? I bought the phones from ORANGE, not the repair center! When I called the repair center, they could not find the phone on their system at all. So the phone is now lost. No one knows where it is. And this after more than 5 weeks. SPEND YOUR MONEY ELSEWHERE!