Drunk waiters an misleading customers

I am so disgusted but the service and how I was treated, firstly the staff was drunk the guy who was serving us between 19:30 and 22:00. I bought a wiki deal voucher n made sure when I got there I asked the waiter regarding the deal and I wasn't told that I also had to pay for the food whereas I bought a deal I wasn't happ5at all that I had to pay a extra R666 after buying a voucher for R600. I am disgusted about everything that was happening most especially being served by a drunk person being misled by the staff and it's not the first time I booked there but this time I'm utterly disgusted.