The IRS is confused

I’d been wondering what was up with my tax rebate. The IRS sent me a notice today saying that I didn’t pay my taxes. Except, I did. They took the $291 I owed right out of my bank account on April 10th. I can only imagine that it was my name change that confused them. I called the 800 number as instructed, and was on hold for so long that my (admittedly decrepit) phone battery died. How exactly I’m supposed to fix this is unclear.