U Haul overcharges

I rented a pick up truck from U Haul, for supposedly $19.95 a day. When you add in the milage and other charges, it was over $80, then to top it off, they told me to lock the truck up when I returned it, which I did, then they hit me with a $60 charge for having locked the keys in the truck. When I complained to the manager, his excuse was that it was a new guy working the counter the day I rented the truck. You would think that they would have a spare set of keys for all their vehicles, or make it right if a customer followed incorrect instructions, but he wouldn't budge. I ended up paying $148 to rent a pick up for one day and a little over 100 miles, what a rip off!