Did you put in unemployment benefits that you didn't actually receive in 2015? If that's the case, then you should amend your 2015 return and remove that income, which should give you a refund of the tax paid on that amount. There are instructions for amending a return here: https://turbotax.intuit.com/tax-tools/tax-tips/General-Tax-Tips/How-to-Correct-Federal-Tax-Returns/I...
