False Advertising - Not sorting out the problem

I posted a report on the 23/4 up till now still no luck on getting my phone sorted out My husband has renewed his contract with Vodacom - in January when he first got the phone the phone was freezing he then took it to vodacom Alberton they said the phone needed a software upgrade which they done he got the phone back. +/- 3 weeks ago we went out - his Sony M2 Aqua which is a water phone that can take pictures underwater. we took a picture of a crab under water that was about 20cm under water the phone then froze and didn't respond. we took it back to Vodacom and they ad to send it in to the repair center, we got notified that the phone was beyond repair due to liquid damage. they are not willing to sort this out we want a new phone or will not be paying for this contract. Previously we had the sony that also takes pictures under the water and no problem. My complaint has not be sorted out instead the phone has been sent back to Vodacom Alberton with no update just that its beyond repaired. we took out the contract for the phone PLEASE REPLACE MY NEW PHONE!!! so many complaints on the sony aqua phones not everyone can be at fault!!!! This is a problem with the phone!!!!