This is a difficult one to fix because you need to undo a submitted return with a new return.
First, I would file the corrected 1040 showing the page for the single-member LLC. That gets your stuff in the right lane.
Second, I would submit a copy of that return along with a copy of the filing that named your husband a single member LLC and a letter explaining that the partnership return was filed in error to the address that you received the penalty notice from. This may not help - you may still receive further letters. But this will get everything into the system so that you can call the service and ask them to help you.
Good luck!
@hollyvie2801
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