Tax return still being processed

I filed on March 4th expecting a return. About two weeks later I received a letter requiring I verify that it was my return (never had that happen before). I immediately went online and took the necessary steps to verify I’m me. Now my return is in tax limbo.

My question is, what can I do about it? Their 800 phone line only repeats back to me what I see online. How do I reach an actual person to figure this out?