Makro appalling not existing customer service. Flat coke zeros

Twice I have purchased a case of 24 x Coke Zero 300 ml through One Cart. Firstly the shoppers have chosen the incorrect item twice which was rectified (once took over week to deliver the correct item!) But what I am actually complaining about is the fact that twice now I have received the case but with a few “flat” coke zeros! Not once, but twice. One case was leaking Coke Zero! I couldn’t find the leaking bottle!! The recent case I bought, about 5 out of the 24 Coke zeros were flat! No bubbles! I’m wondering if Makro has been storing these cases too long or if this is a supplier issue by Coca Cola?? I’m not even bothering to complain direct to Makro as their customer service is non existent! Pathetic and definitely needs improvement! I have stopped using Makro direct as once my shopping (all groceries) took nearly two weeks to arrive!! In the interim I had to by the same items elsewhere as I needed them! But makro felt they did nothing wrong I even though app said delivery in 2 days. I’m so appalled and disappointed in Makros attitude and lack customer support… they don’t see the error of their ways! Makro drags down One Cart!