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I'm sorry to hear that.
I suggest that you raise this with your local support team to proceed with this in the best possible way.
Local support.
I'm sorry to hear that. Unfortunately there isn't much else I can advise you to do.
Unfortunately I can't really answer these questions. Only the local support can help you with this case.
Follow @Samuel's advice and contact your local Xperia Care, all those questions can only be answer by your local team.
You will get replacements as long as it's the device's fault and not yours. Also you said, the water entered the device... If so the device should be replaced and not getting new seals. You better contact sony request a vacuum test and ask them for a replacement. We can't help more as its a problem between you and sony, we cant advice more than telling you to contact sony. If the device is not responsive then take a bowl of rice, open all flaps (take out the sim and sd) and place it in the bowl for a week.