Facebook verification code does not seem to work, and when it does send a code, it is the same code and doesn't work

Hi, I'm trying to help my wife recover her account, but when they send the verification code, it only goes through once in a while and it's always the same code and it NEVER works. I'm out of ideas. The other day we stumbled on a way to upload a selfie which worked, but it was hacked again and I can't find my way back to that option. Any help is greatly appreciated.