The IRS should automatically adjust your tax return and pay the remaining refund. (If you were expecting $1000, they should send $400, and so on.)
Did the adjustment change your tax return from expecting a refund to owing a payment?
Only you can look up your account to see where the remaining refund is, if one is due. What does the "where's my refund" tool tell you? https://www.irs.gov/refunds