Any worker working for an agency who is not guaranteed hours or stability of employment is open to exploitation. This is especially true for the new wave of unskilled workers with very limited language skills. It was not my problem as such but it was this Pole who told me how he was not being paid for his work and was given a long list of broken promises and petrol allowances that never arrived. If he did two weeks work in June, it is reasonable to expect payment by now-it is now mid October!
Stop stiring the pot Mike! Besides you need to focus more on your studies rather than the forum.