Quote Tim Rainey:
Yamaha Japan’s unhelpful attitude seems to say they care little once they have your money.
I'm afraid that's typical of (some) Japanese companies. From a Japanese perspective, admitting there is a problem and resolving it means that the company is guilty, which is a disgrace. That this attitude contradicts with the viewpoint of almost any other culture doesn't matter to them.
The best way to deal with this is coming with clear proof, backed up with arguments, why you think your strategy or vision is better than theirs. It's important to do this in a friendly and polite way, otherwise they'll slam the door shut permanently.
Mind that not all Japanese companies adhere to this policy, but a little respect and friendliness gets you further than just handing them a petition and saying that you are not alone in regretting to see mLan disappear.
Imagination is more important than knowledge - A. Einstein