The 4464C letter is notification that the IRS is reviewing your return. They are verifying the information reported on your tax return and matching documents they received from payers such as W2s and 1099s. It is not an audit. They will normally hold your refund until the review is complete.
You can check their website as it is updated once per day. Please use this link to track your refund from the IRS. https://www.irs.gov/newsroom/use-the-wheres-my-refund-tool
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