Below is the automated response I received (none of which is true).
We changed the amount claimed as Recovery Rebate Credit on your tax return. The error was in one or more of the following:
- The Social Security number of one or more individuals claimed as a qualifying dependent was missing or incomplete.
- The last name of one or more individuals claimed as a qualifying dependent does not match our records.
- One or more individuals claimed as a qualifying dependent exceeds the age limit.
- Your adjusted gross income exceeds $75,000 ($150,000 if married filing jointly, $112,500 if head of household).
When calling, it seems that their automated system does everything it can to get you off the line. When I finally got through, I was told by their automated system that they are too busy for more calls today and to try again at another time.