Vodacom refuse to repair their product under waran

I upgrade my contract 1st of May and I received a Sony Experia Z3 two months later the front screen came loose.<br> This is a factory fault and needs to be repaired under warranty.<br> <br> Vodacom came back to me with an account of R2500. And now suddenly it is Cracked at the back.<br> <br> They don\t want to repair my phone and gave it back unrepaired"