@zerenia
I doubt even managers have the ability to change fees, but it won’t hurt to call and ask. Maybe try requesting a courtesy credit on the bill, especially if you had any problems with service experience or the car itself. If you’re going to have the car for awhile, maybe ask for a free upgrade or amenity (e.g., unlimited miles, model upgrade, no gas refill requirement, additional driver, etc.). I think your ability to negotiate would have been stronger before you took possession of the car.