Coca Cola without ACID

What is happening with your Coca Cola soda. We bought 6x 2L cokes for a braai at home and all of them did not have acid nor make that sound that it usually make when we open them. It was like sweet tea. We did not even shake them. Coke is my favourite drink and now it is starting to disappoint and drop the ball. I thought I should make you guys aware of it. It is these new 2l bottles with green lids. Coca Cola please do not drop the ball.. It was disappointing and dissatisfying to drink a coke without any acid and sparkles.I am a big fan of coke and I know what I drank did not come close to my everyday Coca Cola.