Crocs caused me a leg pain

It is with a sad heart. I bought crocs on their friendship day promotion. From the first day I wore them I was shocked to find out they are not as comfortable as I have heard, my children have always woren them. But I thought maybe they are still new, it just worsen. I contacted their service desk and was asked to send pictures and the invoice. After I have done a follow up I was told nothing will be done as their warranty doesn't cover shoes that have no tags on. My crocs were 2 weeks old, as I speak I have a leg condition caused by this very shoes. They didn't even bother to send their courier to pick the shoes for inspection. This breaks my heart that I have a medical condition caused by their shoe and nothing is done. I will never be buying anything from them.