After you file

Sorry Turbo Tax can't help you file or pay 2015.  And the IRS has nothing to do with a state tax return and wouldn't be asking you to file state.  Do you mean the state sent you a letter?  Did  they not get your state return or the Tax Due payment?  I think it would be the tax due.  If the letter is legit you need to pay it as soon as possible plus any late fees and interest.   But this sounds very suspicious.  The IRS and states never call, they only send letters in the mail.  Did you call the state yourself?   Be careful,  could be a scam.  A $1,000 fee sounds very wrong.  CALL THE STATE DIRECTLY.