1L Coke Zero expired 7months ago

I purchased a 1L Coke Zero from Portugese Takeaways situated in Sanlam Centre, Parow Cape Town on 1 October 2015. On initial taste my husband and I knew something was off but just brushed it off thinking it might be a result of the bubble gum we had just eaten that we find the taste different. <br> <br> On further inspection though I checked the expiry date only to find that the product had expired on 11 February 2015, 7 months ago<br> <br> I lodged a complaint on Cokes website, have pictures and also kept the bottle. I await some feedback<br> <br> <br>