If the IRS adjusts your refund then they will follow up with a letter in about 3 weeks.
$1,200 sounds like you claimed you have not receive the stimulus and IRS records show that you did but could be something else.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
You may have other debts that are being paid by the refund. Although the economic impact payment could only go to pay back child support, the Recovery Rebate Credit can be applied to back taxes or any other debts owed to other government agencies.