Coke Zero with zero fizz

I have now experienced this issue 3 times. I ordered food through Mr D and included in my order was 3 x Coke Zero 1.25 L. Upon delivery we found that all 3 bottles had no fizz. I tried complaining about this on the Mr D app and this too came to nothing. I then purchased a 330ml Coke Zero from a fuel station and that too had no fizz. Is there an issue with co2 in Cape Town? I tried calling Peninsula Beverages and waited for 5 mins with no one answering and once I got back to the receptionist I got told to phone back later. Great customer care Penbev.