This is ridiculous ... if there's a problem with older 3W chassis then the client should pay ZERO in the process of it being "fixed". If MMC demands the "fixing" to be done by dealer (and I understand that) then they should offer compensation for anyone that has considerable costs to get the car to the dealer. And of course any and all parts needed for the "fix" should be free.
drk I'm not sure if this applies to you but I belong to an automobile association from my country (I suppose there's one in every country ion Europe) and my membership grants me two yearly vehicle tow truck transportantions, no questions asked. Maybe you also have something similar? Also, maybe your credit cards or even the M3W insurance allows for it to be towed to the dealer, if you claim there's a problem to the car that needs it to be assisted?
Just ideas to help out, I really think you should get your car checked and fixed, you will be in great danger if you continue using your M3W without doing it.