Stuck in Private Company`s common shares?

I have a number of common shares issued from a Canadian private company (in Ontario) when I used to work there years back. Recently they`re going to invite a new businesss investor for 15 millions captial raise by issueing more common shares. What I`m worrying is it could be used as a tool to thinner our shares and make our share worthless. Other fact is the company never pay us any dividends, basically for all the money we put in, there is ZERO return for almost 10 years even they`re making profit. My question is, is there a way out I can get at least some money back from them rather than watching the directors playing the burn money game? I fully understand it is a private company, but is there anyway we can have a little control of our money or protection by law? so far, it makes no return and can't sell it back, all my money is sinking there.