No charging after get wet

My phone dropped in the water about 1 week ago. Soon I opened it and dried with cold hairdryer the mater board and all the contacts. After 3 4 hours a tried to switch on and it worked fine. After about 3 days during the night the phone switched off. I did not know why. When I tried to charge it the phone showed the dock was connected but did not charge the battery. So I bought and replaced a new dock charge inside the phone but remained the same problem. Moreover at the time no more signals that the charger is connected. What can I do now? Thank you for your reply!!! I apologise for my bad English.