After you file

I filed my taxes in May and finally outreached to the IRS in early July. They stated that a letter had been mailed to me. I never received it. They resent the letter that took 14 days to get .Finally I called to verify my identity and when he was going to have the system ask me questions the it failed because I had received the wrong letter. I’m sooo annoyed. Now I have to wait 14 more days. And from what I read additional 9 weeks. What kind of questions do they ask? Can some one tell me?