Damaged phone must be replaced

Contract renewed 1 Aug 2015. 10 Dec phone automatically switched off & stopped working. Vodacom Eastpoint Boksburg said software update needed, they went offline while doing update. Told to take it to Eastgate Vodacare. Phone was booked in 12 Dec & told we could collect it on 14 Dec. Day of collection were told phone is in repair process awaiting spares. On further enquiry told that the battery pack is to be replaced & we would be contacted to collect phone weekend of 19 Dec. Also told screen is damaged. Contacted them week of 21 Dec as no feedback received. Told that the phone is water damaged & we can collect it as it is beyond repair. Vodacom have failed to explain how is it that the phone went from needing a simple software update, to the battery pack needing to be replaced & the screen damaged to being water damaged & beyond repair. Note this is a waterproof phone. There was NO DAMAGE to phone when it was handed to them. Escalated to Advanced Repair Centre on 2 Jan 2016. To date matter not resolved & NO feedback. Phone is still with Vodacom. Phone less than 6 months old. They must replace phone! Won't hesitate to cancel 2 other contracts when due for renewal!