My ex-wife filed our taxes as joint. She has Indiana taxes and I do not. When she filed them, Indiana wrongly decided she was n't eligible for exemptions despite her military status that granted her the exemptions. 
The Indiana IRS reported poorly on my credit and I disputed it, which ended with them sending me a check for $ XXXX. 
It has been over two years and XXXX disputes later, and this remains on my credit and is bringing down my score despite it being wrong.