non delivery of company policy

i signed a contract a year ago with Vodacom I chose a sony phone because it is water proof i never had opportunity to use it for underwater photos as i had seen many people doing so with beautiful results so i decided to put it to the test before using. i followed instructions in pamphlet and proceeded to take a photo under water upon which the phone immediately switched off i rushed to dry it and plugged in the charger thinking battery was perhaps low . the phone was in fact working but could not charge so at my earliest opportunity i took it to vodacom at greenacres to have it repaired. it is now a month later and after taking it in twice to be assessed i was simply told it is in fact water damage . i was upset and told them that its supposed to be water proof they were ******** and in fact started to serve other customers before finishing serving me . i also gave my charger and memory card with the the phone which they have lost. they offered to give me the sony reps number but i believe my case and contract is with vodacom who have left me stranded 'no power to me' I will not honor my contract payments any further and will be applying for a contract with mtn instead