Attempted to purchase 2019 santa fe limited on 8/2...

Attempted to purchase 2019 santa fe limited on 8/2019. While I worked on a sale price with dealership, I also started my car loan with my bank, usaa. Usaa recommended using their car buying service via the internet for members at same time. Did so and the same hardeville dealership came back with a lower price, than previously quoted me, for usaa members. Called dealership back and asked them to validate the usaa price as we had not finalized any car purchase . They refused the $300 difference. Stated limited availability. I filed complaint thru usaa, went down to Savannah dealership next day and bought exact vehicle at usaa member price listed. And got the specific santa fe, because of color, transferred from hardeville dealership to me.