I am sorry you had this experience. See this help article and this one for instructions on how to contact TurboTax customer support depending on which product you are using.
We at Intuit TurboTax want our users to be completely delighted with their experience using our products and services, and successful in their financial lives and businesses.
Once you file your return, as long as the settings to receive communication from Intuit don’t block it, you will see a pop-up message or receive an email with a survey asking you about your experience. We encourage you to leave your notes and comments there. “Voice of the Customer” notes and comments are read and acted upon.
If you are using TurboTax Desktop, you can also leave feedback at the Final Steps tab:

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