Competition code dose not work

I bought a 2L Coke Bottle yesturday, this morning when I went to enter the Make Happiness Happen competition the code entered told me that it was used or is incorrect and I entered the code four time.<br> <br> I purchase about 2 - 4 2L coke a day and this is not nice entering a competition and the details that they provided is incorrect what happens if that is a winning number for something now I lost out.<br> <br> this is unexceptible.