Well, do you have any revenue now? The 3rd year revenue target sounds great, but right now my impression is that you hold 4% of nothing or very little. Maybe you are getting edged out over dilution, but are youg etting edged out for 4%? It's not clear. I think you might want to rewrite this in paragraphs instead of bullet points; I appreciate that your two partners seem to cooperating to edge you out after taking possession of your idea, but it's still a bit vague and I can't figure out how well grounded your complaint is.

If you have social connection to lawyers, exercise them - many lawyers will give you a half hour consultation for free, and if you have a decent case that is worth fighting they'll take it on contingency. If you have a decent case that's not worth fighting then they may be able to advise you on how to either protect your interest in the business, or negotiate a buyout of your equity on your behalf. Presumably your erstwhile partners are gambling on the fact that the value of your equity is less than the cost of defending it at present...but again I can't really guess what's going on from this telegraphic description.

Also, take the weekend to evaluate whether you are a) being paranoid, b) overstimating the NPV of tis idea and c) whether you could call their bluff and set up in competition - an obvious breach of contract, but if you get to market first, something that can be written off as a business cost. If you are getting shafted, then playing hardball is a perfectly valid strategy, ethically speaking.

Not a lawyer, and again this is very handwavey because your description leaves so much to the imagination.