It sounds like you need to file an amended SD100, for each year. The form is pretty simple. you might try on your own.
https://www.tax.ohio.gov/portals/0/forms/school_district_income/2015/SDIT_SD100_FI.pdf
https://www.tax.ohio.gov/portals/0/forms/ohio_individual/individual/2016/SDIT_SD100.pdf
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