Yes and no. You can contest anything, but it is not likely that it would do you any good. MAX would not help with contesting it as this is not an accuracy issue this is a common dispute issue this year.
If you do not think you received what the letter says, you should call the IRS to verify what they believe they sent you. If you did not get the payments they claim you did, then you would need to ask them to reissue it separate from your return. Entering what the letter says will be your best bet. The IRS has been adjusting a lot of returns this year for both the stimulus payments and the child tax credit. If their records show you received it, they will adjust your refund to match their records.
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