Share your experience!
Hi,
I'm sorry to hear that. As far as I can see, you have been in contact with your local support team which have given you the information that your phone passes the vacuum test which the service center has performed. This shows that the phone has no leakage when the caps are closed.
Unfortunately, I do not think there are any workaround if the phone is water damaged since the service center should replace the phone instead of repairing it.
But you would do best by raising this with your local support team for further information since repairs are handled at a local level:
http://support.sonymobile.com/global-en/contactUs/