To contact TurboTax customer service, I clicked "Contact Us" on the bottom left side of this page, then filled out the form, and was given a Support ID number and a Phone number to call. I was not asked to pay.
The button I clicked was on the federal form portion, right at the very beginning, before filling out any income information, where you have to fill in your name and personal info. There were buttons on the bottom of the page asking if you were active military for whole or part of the year. I think I transferred information from 2018 year's return, so it did not have the correct answer filled out which changed since then.
Hope this helps.
