Sorry, and I think this is the first time I have ever got ranty on the tinterweb with anyone, but you have given enough information for me to form an opinion now...
You have had a multitude of advice, views and suggestions.
There are views on your side, on the manufacturers side, and you are armed with enough information and opinion to make a decision. However, from what I see, you're not doing anything but complain because you've inferred that their last contact suggested you may not win.
I think you have been done slightly for what it's worth on intital comms (as I've supported you with before), but for heaven's sake, initial anger allowing, time to reflect, you have suggestions of approach and downright support for your situation now, so why don't you do something about it?
You have plenty enough information and angles to make a tactful, factual and well-publicised approach to sort this out - I would suggest that the fuss you have created may persuade them to take your side, just for the positive publicity alone.
However, all you're doing is naff all, but post on here about how hard done by you are.
Seriously, do something, or stop posting.