I don't want to owe money because too much was returned. When I do the calculations, based on the info they gave me I should actually owe them $420.
Did you enter any 1099R? If 1040 line 4a is a lot less than 4b (which should be ok) the IRS has been lowering the taxable amount on 4b and refunding you. But then they will eventually want it back.
I received a CP24 notice March 4th do you know when I should be receiving it
Sorry. I wanted to know when i should receive my refund
It sounds like the IRS is adjusting your original refund from $2,700 to $2,280 (not that you are due another $2,280). The letter you received should give details on why this adjustment was made. You will likely receive a notice for the amount you owe back to them in the coming weeks.