TurboTax does not get any information from your state after you file your tax return. TurboTax does not/cannot intercede with the state on your behalf. The reference number has no meaning to TT or to anyone in the user forum. You are going to have to contact your state and work it out with the state. You have not told us much about the letter except that you made a mistake regarding your relationship to children you claimed. We do not know what the state asked you to do, nor have you even mentioned what tax year this is about.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
