Parmalat ,Sasko and Kota Festival Disappointed ME (Milkshake Bar)

I would first like to express my disappointment concerning the Kota festival.I was one of the traders at the fest,and was never paid for my products by the organisers of Kota festival as well as its sponsors.The organiser,called Sidwell has been giving me a run around since the event ended.Its been weeks and im yet to get my funds for the coupons we were advised to take from the media.Now the organisers are hostin another event yet they havent paid me.Im sure Sasko,and Parmalat has a work ethic and does not like to be included in such disputes ,but im deeply hurt by the fact that i was taken for a ride.I wouldnt have taken the coupons had i known they were a way to rip me off ,and ***** my profits,especially for the success that the event had.Who else do i talk to if not the organisers.Please advise on the next move

Regards Bonginkosi Radebe **********