How Do i report TurboTax State (Iowa) Calculation Anomalies

Does anybody know the appropriate method to contact TurboTax about what I believe are calculation problems with their product when filling out the Iowa state data?  I believe there are issues with calculating taxable income adjustments (Schedule 1) and with the actual tax calculation for those are at least 65 years old.  If I can't get these resolved, I question whether I will be able to use TurboTax for an accurate state filing.