Account Stolen - How to Get it Back?

I got an email 3 weeks ago at 3 am that they detected a login from California (live in Kansas), then another email saying I updated my phone number (Japanese location).
The next morning I tried to get to my account and it says account not found.

*I contacted support in the app, and they asked for information to prove it was my account, but have not heard anything for 2 weeks so don't think anything is going to happen with that.

But wondering what else to do/try to get my account back (who to contact)?