Last year, after e-filing my tax for 2019, I found that I missed something. So I sent my amendation to IRS then. Before the amendation, I owed IRS $1 (but I didn't pay it). After the amendation, IRS should return a refund of $1270 to me.
Recently, I received the refund check from IRS with the wrong amount: $1271 plus some interest. (I also checked the IRS online tax transcript, which shows the same wrong amount.)
What should I do now? Should I call IRS or directly send the check back to IRS?
