Birodh: This one is for you. If the employer said in the court that they paid him in cash as usual and he is just trying to make some easy money. How are you going to prove that they did not? I don't know how the witnesses are going to help. I don't think people get paid in presence of others usually.

I would suggest writing them a letter or faxing them asking for payment a couple of times. If they don't refute it, that could serve as a proof of them owing you something.