Have you read my edit in my last post though? That might help you out.
Yes, but 2FA backup doesn'work...
"Hackers" changed all my passwords and 2Fa (login pass and trade pass), impossible to access my account, after that, i sent my kyc to gate.io team and they reset my 2FA... after login, i can see this:

and this... empty wallets..
https://i.imgur.com/KO4ruMF.jpgIt seems like they have had access to your email address, because via your email it's possible to turn off the 2FA. Try to restore your inbox, junk, trash can, deleted trash can messages, etc. There will be a notification email if someone else has been in there (on the assumption it's an outsider). Google can assist you in restoring this all if you notify them about this. And were you able to trace the DOGECOIN somewhere?
If you think it's an insider, look up their company registration and trace all employers. Report the company at Interpol, econsumer.gov/#crnt and your local authorities. Won't get you your money back, but if enough people report this they will investigate this matter eventually.
I haven't heard this kind of complaint before about Gate.io. The reaction doesn't suit them either. Nothing's impossible though.