It sounds like this may be a known scam that the IRS issued an alert about. Please review the information in this IRS link carefully then call the IRS at at 800-829-1040 to ensure it wasn't a recalculation. If it is not a recalculation, follow the procedures listed in this link (void the check, etc): https://www.irs.gov/newsroom/scam-alert-irs-urges-taxpayers-to-watch-out-for-erroneous-refunds-bewar...
"TurboTaxMErinHuf TurboTax Tax Support Agent"
To reach a IRS representative please call 800-829-1040 7 a.m. to 7 p.m.
local time and do the following:
1. press 1 for English
listen to the recorded
message
2. press 2 for answers about personal income
taxes
listen to the recorded
message
3. press 1 for questions about a form you
already submitted
4. press 3 for all other questions
5. press 2 for all other questions
6. enter your social or EIN
confirm type (social or
EIN) and confirm if the number is right by pressing 1
7. Listen to all options then it will say if
you have not heard your topic please hold
8. Next, it will say if you owe money and
agree with the amount press 1
You will then be transferred to a
representative after a general message from the IRS (Note* if call volume is too
high they will ask you to call back)