First, I'm sorry to hear about your misfortune. My initial recommendation would be to try to find a local, trustworthy phone repair shop for a second opinion. Otherwise, consider:
- Continue to use your OP3 as your daily driver for when you don't need Wi-Fi, and pick up a good, cheap Android for your Wi-Fi use. (obviously depends on your usage patters - I work 9-5 at a place without Wi-Fi so I could probably get away with this)
- Sell your OP3 for whatever you can get for it and use this opportunity to try a new and different phone
- I always put my phone in a bag of rice after I drop it in the water (yes, it's happened more than once with varying degrees of recovery). If you haven't done this, you could still try it. I'm grasping at straws I know, but if it were me I'd try it.
Good luck