Pantech Renue P6030 unresponsive buttons and vibrates with no power?

I had my phone in my pocket when it started to rain. I was completely soaked but my phone only showed water on the edges of the phone. The phone now vibrates constantly or sometimes on and off. It even vibrates while the power is turned off. The only way I can get it to completely stop is to take out the battery. The keyboard no longer works as well as the volume buttons. The power button is the only button that works. I am able to text using the touch screen and also able to make calls. The entire time I'm working on the phone, it is vibrating. What happened and is there a way to fix it?