State tax filing

Maybe someone can help me here on some advice:

The OTC has reached out to me regarding my Tax Returns from 2017-2019 on saying I owe them back now.

1. I’m a Cherokee Indian with my Indian Card

2. I worked for the Cherokee Hard Rock Casino in Catoosa/Tulsa.

3. I rented my home & resided in Claremore, which is Cherokee Land. “ Where can I find proof that this is on Indian Land of my Tribe” 

I figured being all 3 I would qualify, but they state I do not.. am I missing something?