Vodacom
Faulty Z10 3 times and they refuse to change phone

I took a blackberry Z10 when doing an upgrade on 18 May 2013
To date, 18 June 2013 i have taken the phone back to shop and given repalcement phone (same make" Z10) twice

Yesterday (monday 17 June 2013) took the second phone in as it was also faulty, and have been booked in for repairs

That means I still don't have a working phone for about 3 weeks in the contract and I still pay full pay
I asked the store and vodacom customer care to change device as I have lost all hope and trust on the Z10, but no... vodacom refuses to change devices.

This is a rip off... what can I do here?