I told her I was traveling back to the airport from Denver, so I didn't need a 2nd group of tolls paid, but she charged me for a 2nd use of toll roads I never used, so I spent > $50 for $9 of toll roads. I said yes, but she didn't tell me I would be charged over $25 for $9 in tolls. The agent asked where I was going, and said she could pre-pay my toll roads for the toll road to Boulder, Co.