I see that the IRS has jumped a step. They apparently don't think that you responded by the deadline of the CP22A, and the CP501 has different instructions:
"What should I do if I disagree with the changes you made?
If you disagree with the changes, call us immediately at the toll-free number shown on your notice. ..."
OK, in this case, because they told you to call them, then call the specific number that they (I hope) listed on the CP501.
But write up your response to the CP22A anyway, in case the CP501 office wants to see it. You will need to have done this to save in your tax file, in case anyone asks, or to use on the CP501 call.
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