While logged in to Turbotax, I entered questions into the ? tab at the upper right corner. Eventually if you say "that didn't help" to enough questions an option should appear for someone to call you back. I did this a few times but have to say spent at least a few hours in total talking to people who tried to be helpful but didn't understand the topic. They may want to share screens and look at your input which is useless in solving the issue and they can't see a return file if you pull it up.
I would strongly suggest that you simply say that there is a similar case outstanding (INV 18814) and insist on speaking with Marty (last name not provided) a tax expert working on that investigation. That's the best advise I can offer. Maybe someone else has a different suggestion.
