Customer Service down the drain!!!!

I processed an order on the 05/08/2015 and 06/08/2015 and payment was received immediately for the 4 orders I processed. I received the order on the 17/08/2015 only to find out that one of the product ordered was not in the pack. I then immediately made contact and emailed them. Till today still do no have closure on my query. When calling in you need to explain yourself like a Parrot over and over again because I don't think at all they have a proper logging system. When emailing you never get a response, then you as the customer need to run after them asking for questions!!!! Now that is customer service for you!!!!! I have never ever received such bad service before, let alone waiting for long for what order and to top it all they have the money all ready. I would not recommend using Groupon at all to purchase products because of bad customer service regardless if it is with the supplier, you Pay a company for service and except feedback from them, not them passing the buck to get rid of the customer hence they have my money already!!