[pyeng]

I would start looking for a new job. There is no excuse for late payment.

And if you don't receive payment in a week, tell you them are going to send the companies details to a debt collection agency. You don't have to do it, but the threat will work.

Keep in mind that this will burn bridges. However, if a company can't afford to pay you and makes excuses (cheque is in the mail etc), perhaps it is time to burn a few bridges.

Check out http://workplace.stackexchange.com A variant of this question has been asked many times, and there are a few good answers.