Display works, touchscreen doesn't.

Okay, so I'll start from the beginning. Just got my iPhone a month ago, had a life proof case. I went into a pool with it (stupid me) it got wet. It worked for around 2 days after and then my touchscreen stopped working. I did a restore and it started working again but failed a couple minutes later. The only thing that gets me confused is how the display is perfectly fine yet my touchscreen doesn't work, I feel as though there is a way to fix it but I haven't found anything on the web about it. All buttons work, fingerprint works but can't use it without the passcode. I've tried checking and cleaning the connectors of the display but no luck. Any tips? do I really have to buy another display even though mines working perfectly fine except for the digitizer?