My worst experience with Naledi Engen Garage

I bought a 2 litre coke and was advised by the cashier to take 2 cokes at a price of R34.00 on special i gladly did that. When i open and drank the coke it was flat and didn't taste like a coke and immediately made my tummy upset, I then checked the expiry date and it was February 2014 and the second one was fine. I immediately took both of them back and Lerato(cashier) said its impossible to have been sold an expired coke and told me to wait whilst she attended to other customers. Then she asked an old man she works with to bring other cokes to compare them. They were not willing to help, gave us bad attitude and told us they couldn't help us. The old man argued with us and did not help. I requested a manager and was ignored. ENGEN NALEDI is the worst and this wasn't my first encounter with having been sold expired goods. I WARN people to be careful. Their service is pathetic and revolting. I regret going there and being disrespected. I'M VERY UPSET and left both the cokes there