No, quite the opposite, it wasn't even made clear that it was a trial (still actually hasn't but I am giving a time frame so people understand.), I was told I was accepting a job at a given wage in person.
Like the message below me, locate and file the paper trail. Do they say how much you will be paid? If your pay was only mentioned in person, is there any recording of the arrangement? Are other "employees" having this problem? Have you tried communicating with the other employees? What reason did the employer give you for not paying?
Do you have any written correspondence to that effect? If so, you should delete this "Ask HN" and get a lawyer. Period.
No written correspondance on the offer. The only written proof of the exact number I have was in the google apps account the ceo deleted.