Sprite Zero still sealed but empty

I bought case sprite zero we used twelve tins after while I take one out of the six pack it was empty. I look at the rest every one was empty. The twelve pack was in the cabinet stored. When I feel at the wooden rank it looks for me the whole twelve pack did leak. I did take a picture off one off the cans to show you that it was still sealed. How can I go on to lodge a complain about this sprite zero?