Found Coke Zone really frustrating to deal with at times - it doesn't always acknowledge the code when you enter it, and then it takes ages for a customer service person to respond to you and help sort it out (and in my case, the experience was drawn out for a couple of months because they seemed to refuse to think my problem was legitimate!)
It's a decent enough idea for a rewards / loyalty scheme but the execution isn't great. Why spend all the time promoting it if you can't back it up with solid customer service?
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