Update.
So I was able to file my 2021 return electronically this year (pulled the right lever on the AGI entry) and I included the double payment in the "estimated payments" section and paid them the rest of what I really owe. So, theoretically, we are square. But since they still can't find the money they took out of my account, they still think I owe them, not only that, but the IRS has still not processed my 2020 return and I finally got a letter demanding payment plus payment for a stimulus payment I never got. I think this is because they based the stimulus payment based on my 2019 status - I got married in 2020 which made us eligible for the stimulus. I was able to get a 180 day extension to avoid garnishment and figure out where the money went. I am still working with my bank to dig up the information on the mysterious ACH withdraw which every agent I have talked with thinks is unusual but can't verify.
