This is part of the email that I received. It seems legit and has the companies address included with it. I don't doubt that it is from the company.
******
Because of a computer glitch, you were over paid by $24 which you should have received in your check today or will receive sometime this week.
We are asking for you to send us a check for $24. Please send it to:
******
However, to be safe I replied with, "Since I haven't cashed the check that was sent, please void it and send me a check with the correct amount. When I receive it, I will destroy the other check".