Sony Xperis Z2 - not waterproof as advertised

My husband got his brand new Sony Xperia Z2 in September 2014. Two days after, he accidentally knocked a glass of water over onto the phone which shouldn't be a problem as the phone is being advertised as water resistant over 1 meter and 30 minutes. Not our Local service provider, a rep from Sony or writing on their Facebook page is helping. I get response but no solution.This is not only extremely frustrating but a massive inconvenience and unacceptable. The phone can't be repaired as the main feature of the phone, being able to function under water, failed. I need Sony to give me answers and a solution. This has been going on for 6 months and that is way too long.