After you file

I received the letter from the IRS on May 9, 2022 that were changes to my tax return. I looked at it but didn't know if it was right or not, so I just let it go. My original return was supposed to be $3826 but the IRS said there were errors on it. I did not call them, I just let it go as I was still supposed to get a refund of $1026. But it is August 15th and so far I have not received it