I would be inclined to say leave immediately, find a new job and rate them negatively on glassdoor. It seems like it's a bit too early for them to not have the financial foresight to be able to pay you. Maybe after a year, but not after just being hired.

If you really care about the company, your role, and have over a year's worth of expendable savings, you could try to convince them that a partnership with an equity stake is a better form of payment for both parties. Good luck though; sounds like they're scheisters.