This is ridiculous behavior on the part of a Main Dealer; nevertheless, it is not unexpected, and the more individuals who condone such shady practices, the more they will continue to do it. You made it quite clear what you wanted them to do, but they chose to disregard your instructions in favor of a speedy "non-fix" that resulted in a hefty fee.
 
	There are a few choices available to you, the first of which is to file a formal grievance with Mercedes Customer Service, or to write a scathing online review on Google that should create results since it will be viewed by everyone, including Merc CS, and/or to visit MCOL - Money Claim Online - Welcome in order to get your money back.
 
	My latest attempt to use the Google review was successful, but the worst that anybody can do is put up with this ridiculously overpriced trash. Best of luck, and please keep us updated....