Deductions & credits

I have a similar issue.  When I completed our 2020 return, I used all the calculations computed by TurboTax with the correct (I presumed) information from the Recovery Rebate Credit Worksheet.  IRS says I owe them back for claiming the $1200 EIP twice.  I've tried reasoning with the IRS (ha, that's been a laugh) but after taking my 2021 refund and applying it to the 2020 owed,  with interest, I still owe them $975.56.  Is TurboTax going to foot that bill because of an error on the form?  I've been dealing with them for over 2 years now and even hired an accountant to look at it (no big help there).  Since it was a software program error, where is TurboTax's liability?