Question for The Coca Cola Bottling Company of Ghana Limited

Why does Coca-Cola taste different all of a sudden. I bought from two different stores and they all had very awkward after taste. I bought the 1.5 litre and I couldn't finish it. I think something needs to be done about this. My mum also bought Coca-Cola and complained about the same thing. I have been taking Coca-Cola since I was young but now my most favorite drink has gone bad. Why?