Is there anyway to refund money when a $9.00 time selected with a $20.00 bill? Have receipt

Check at the ranger station.

No, its automated and park rangers cant help

I would call their dispute telephone number

I dont think the machine gives change. Have some ones or a card.

I think it says on the parking ticket kiosk to use exact change..

I would assume so but just to be safe bring ones or fives