If you were never legally married you cannot file as Married Filing Joint. You can file as Single or Head of Household (if you qualify). You need to follow what the IRS stated you need to do in their letter. To change the filing status of your return, you can amend it. Amended returns must be mailed.
Do I qualify for Head of Household in 2019?
You can qualify for Head of Household if you:
- Were unmarried as of December 31, 2019 and
- Paid more than half the cost to run your (or a qualifying parent's) home this year(rent, mortgage, utilities, etc.) and
- Supported a qualifying person.
If you were still legally married as of December 31, 2019 and a child lives with you, you can qualify for Head of Household under a slightly different set of rules. Read more
After you answer all the questions about yourself and your dependents at the beginning of your return, we'll let you know if your situation qualifies for Head of Household.
You can also revisit these questions by selecting My Info (online) or Personal Info (software), and then selecting Edit next to your name or your dependent's.
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How to amend (change or correct) a return you already filed
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
