BER Liquid damage- water proof device

In November I purchased a device from Vodashop lenasia, where the consultant advised ME about the billing and that handset uses data and not BIS. A Sony xperia Z3 (the big one) which advertised as been water proof. I walked into the repair store to get it repaired as the device fell in the water and device was only 2 months old. When i sent the device to repairs Alberton city, they said Its a BER. I was told me It will be chargeable. The thing I don't understand is that the device is supposed to be water proof as it was emphasized on the adverti*****t, It should have survived. SO ITS EITHER THIS IS BASICALLY FALSE ADVERTISING OR *****ERY WORK. I refuse to be in a situation where i have to pay for a device which was advertised as it can survive 1 metre for 30 minutes and my device didnt even last for a minute before switching off.I requested for my BIS to be deactivated and my data to be loaded with my contract but from the time i took the device out, i have been billed for data but was never receiving it and also charged with bis. i called 082155 AND ACCOUNTS and wasnt successful.i demand to be contacted from the head of vodacom. ref: S3-8XR2L-LUK6Q was done at vodashop lenasia