Have you talked to the folks at BoomStartup about the situation? As investors and leaders in the company, they will want to know about (and it would be in their interests to help resolve) any potential legal situations. I am not a lawyer, but I would guess that if you cannot afford to fight this legally (though I wouldn't tell them that), talking to them is more likely to get you what you agreed on than just walking away.
I have talked to them and they are mediating a resolution, but if there can be none, I'll burn my team down reputation wise-- I used to work in SEO/Content Marketing and I'll make sure any investor who does due diligence will NEVER invest in them.
Threatening to "burn down" a previous employer on an account that's associated with your real name, even when you think they deserve it, is another really good way to steer clear of companies that offer long-term stable employment.
