Bundled with a bunch of charges that were, in fact owed. OP disputed the whole charge (probably because that was the only option), but it's important to know that Hertz did come after him for the rest of the money.
Right: as you say there probably was no other option -- OP was in a bind because all the charges are packaged together. There wasn't really a neat solution to this, except how OP played it, which could have ended up going badly wrong.