Worst online shopping experience

I did an online shopping on Friday the 24th of June and was called to collect on Saturday at Makro Alberton. I got there 10 minutes before closing time and I collected my order. When I opened the box of 6×1.2kg kellogs cornflakes, 1 was missing. I called them first thing on Monday to notify them and was told to wait for a callback because they were still checking. After 5hours of waiting for their call I decided to check on them and only then was I advised to come to the ship with the box and collect another 1. When I got there with the box they handed me the missing pack and I asked why did they tell me to bring the box? they said maybe the person who picked up my call misunderstood the instructions. I drove all the way from work to their shop because of their carelessness when packing my order and no one even bothered to apologize after inconveniencing me and causing me to use my fuel twice because of their mistake.I was furious when I left the online pick up point because they didn't even show remorse or anything. I've bought at other Makros before but the Alberton one was a nightmare and they didn't even apply TCF and acknowledge their fault. What a waste of my time and fuel this was the worst customer experience I ever came across when doing online shopping.