Based on what you’re describing, this seems like a classic instance in which the IRS’s Taxpayer Advocate Service could be of assistance.
You state that you’ve “I’ve contacted a tax asst;” this doesn’t sound like the Taxpayer Advocate, but even if it was, you should contact them again.
Please see the TurboTax Help article How Can the Taxpayer Advocate Service Help Me? and the IRS's Taxpayer Advocate Service page for guidance.
