Bought 10 Coke and 10 Coke zero's and all are flat

Good day <br> <br> My name is Jolene, on the back Friday the 27th November I bought, 10 Cokes and 10 Coke zero's, every single one I have opened was flat. i was so disappointed in that, is that really the type of Quality that coke is giving there customers. Even before this incident, there was also a few times when i bought coke and it was flat, i buy every single day Coke or Coke zero, this is a *******. please can someone get back to me with this complaint, my number is ***. <br> <br> Thank you