Dishonest business practices - Automatic Hertz Fuel Surcharges - Renter beware

I rented a Hertz rental car in Detroit through hotwire. I returned the car full of gas, but there was no attendant there to process the return.

A random hertz bill showed up today. According to their agents, Hertz's computer system automatically charges customers for missing fuel if there is no agent there to process the car ($31.13 in my case). What a sham! Good thing I had a receipt from the gas station around the corner and a photo of the dash console when I dropped off the car. That is the last time I rent from Hertz. Hertz insisted on billing me $2.31 in tax which was supposed to be credited as part of the hotwire rental.