Nothing we can.
Log into facebook on a desktop, or laptop. Does that help, or did you not know the password?
This is why you always create accounts away from the mobile device, recover the account, make changes t it (from any PC), and if you understand how to do all of that, then you attach a mobile number to it. Too little, too late, I get it!
Your mobile carrier wouldn't issue you the same number? You need to demand the same number. If they won't then change carriers!