After you file

I was told my 45 day wait to started Jan 25th. Which means thats takes it to April 11th. But I was told that im under a regular review right and the rep couldnt tell me if I was gonna have a letter sent ir not. He said right its just under review and they have 45 days to reveiw and send a letter and said if I dint have my refund by April 12th to call. WHAT THE FUCK. I been told from the beginning that there's nothing wrong. And now this. But he also said that it could possibly be a verification of 1 or more things. No more than 4. Like, tax credit, income, business tax and something else. Only the first 2 would apply to me