Vodacom refuse to reapir Sony Z3- Waterproof

My Sony Xperia Z3 screen went blank middle of the day and then it was sent through to Vodacom customer care in gateway for repairs. This phone is used for business so then I followed up on the repair 2 days from drop off then 4 days later and then 6 days later. Consultants then explained the phone has returned from jhb repair centre and could not be repaired due to it being liquid damage yet the phone was not exposed to water and was working perfectly fine.What I fail to understand is that the phone is advertised to be dust and water resistance and here they are trying to pull a fast one and ***** the customer over. i wonder how many people they actually do this to. Consultants took down my details and said manager will call me with feedback. that didn't happen. I then called to speak to the manager directly and he said he will contact me back after looking at the phone himself and guess what, that still didn't happen. Being a Vodacom customer for somewhat more than 12 to 14 years im very disappointed in the service I have received is the past few days. Also the way the consultants carry out their duties as the feedback is pathetic and will be forced to put this in the local paper