Where is your old phone? Broken? Why not just turn it on and get the 2FA code??
I got it replaced, so its in the possession of Apple
If you didn't make a back up on secret code then all you can do is Email their support.
You should make a back up on all of your files especially the 2fa, When you scan the code there is a text that you should copy for back up. You can write it on paper or copy and paste.
I have the same problem.
They are not replying to the support tickets.