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I'm sorry to hear that, but to be 100% that your phone will remain waterprooof you could repair the phone yourself and then contact your local Xperia care and request a vacuum test or just get them to repair it
If you want to DIY, there are myriad videos and guides online
https://www.youtube.com/watch?v=MnrRXhhhE04
as long as you have the proper tools and watch / check the videos multiple times before you start and make sure to get a new double sided tape for both pannels .