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I'm sorry to hear that, first thing, remove the SIM and SD cards > open all the covers > leave them open > place it in a bowl with rice for one or two days
do NOT use a vacuum, heater, sun, hair dryer, microwave, etc to dry the phone, it will damage it, do NOT attempt to turn it on nor charge it.
Contact your Local support and request a vacuum test, this will prove if you have a defective unit or if you didn't closed the covers correctly