Very poor service

I have been dealing with Vodacom Menlyn since 27Feb'15 trying to get my ****aged Iphone back from their repair centre, it has been a constant battle of no feedback and false feedback since then, all I want is for my phone to be repaired since 27Feb'15 , the Iphone is only 2 months old and the screen is lifting up due to a swollen battery, but now the repair centre is claiming that due to the screen lifting the phone is no longer under warranty? When dealing with the Repair Centre manager, we bearly get feedback unless we phone them, and get to speak to anyone after the 10th phonecall! I rate this as very bad service due to the false feedback we bearly receive only upon phoning them! And after 2 months I still don't have a phone, repaired or not!