Amended my 2019 Taxes, I ended up owing money. I paid immediately online, but the IRS sent back the payment by check.

Hi all,

 

I amended my 2019 tax return, and I ended up owing money (my original refund was higher than what is should've been, thus I ended up owing money). I paid the IRS online. I added the payment confirmation number on the 1040X, then mailed the amended return (2019 was done by mail).

 

Fast forward a month or two, I got a check in the mail from the IRS for the exact amount I paid them upon amending my return. They literally sent back my payment.

 

I paid immediately to halt the interest and penalties... but now I have a check for that same amount. I'd imagine the IRS hasn't processed my amended return. My IRS "account" says I owe them $0.

 

Should I cash the check and wait for the IRS to send me a letter I owe them, and then pay them again online? Calling the IRS has so far been impossible. I have proof I paid them a long time ago, so I'd imagine the penalties/interest should have stopped by then.

 

Any ideas on what to do? Thanks!