Typically, the IRS will detect a duplicate payment such as this, and send you a refund within a few weeks.
But since it's been almost a year and you haven't received the refund, you should contact the IRS. For telephone assistance, see Telephone and Local Assistance at the IRS' Let Us Help You page.
IRS's customer service might advise that, if you haven't filed your 2019 return yet, you might enter the overpaid amount as an estimated tax payment on your 2019 return, or as an amount applied from last year's return to your 2019 return. But get the green light from the IRS before doing that.
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