It sounds as if you had an offset to your refund. The IRS will generally send a letter to explain why your refund was reduced. However, if you don't receive a notice you can contact the BFS (Bureau of the Fiscal Service) at their call center 800-304-3107. They are open Monday through Friday 7:30 am to 5 pm CST. (source: https://www.irs.gov/taxtopics/tc203)
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