@Howardrubin1
Did the letter not indicate any clue as to why your refund amount increased?
If you need help with that letter or understanding why your refund increased by the IRS, you can talk to TurboTax free Audit Support Center. They are likely much easier to reach than the IRS right now. They help with IRS letters and can question you about items on your return to see if there is a clue as to why your return differed. You may still have to phone the IRS later for specific info if any question persists.
To get the phone number for the TurboTax free Audit Support Center go to the link below, and near the top left where it says "We can help you with your tax letter," click the blue "Get Help" button, and follow the prompts.
https://support.turbotax.intuit.com/irs-notice/audit-support/
