The State of Ohio says that they did not receive the School District portion of my 2017 return. Trying to get hold of TurboTax to fix this... how do I?

Yes. In your case, I recommend calling 1-877-216-2138 to reach an agent prepared to assist you with this issue. 

Click this article regarding 2016 Ohio School District Tax that may apply to you, as well.

For any other matters, here is the general resource to contact TurboTax support.