I recently reserved a car, then picked it up and had $7+ of bogus fees added to the contract. The fees were listed in the contract provided both at pickup and at return -- but by the time I arrived for pickup, it was no longer plausible to shop around (to another car rental vendor) for a better price.

I credit that web reservations all say the taxes and fees are not guaranteed. But the location confirmed to me that the undisclosed fees are nothing new -- they're fees that this location has been adding for a long time. And they're fees, not taxes -- not directly remitted to any government or regulatory authority.

I contacted Hertz customer service via the web site. They initially refused to refund the difference. When pressed, they agreed to issue a refund for goodwill -- but they made no commitment that another Hertz location won't do the same thing to me next time. Nor is there any apparent guarantee that the additional fee next time will be $7 rather than $17 or $27.

I'd like to push Hertz harder on this. Suggestions as to how? Write to the AG of the state in which the rental occurred? Anything else?

Any authority, AG lawsuit, class action, or other dispute I can cite for the proposition that a Hertz location can't supplement a prebooked reservation with whatever bogus fees they choose to add?