I have Kamik boots, and they have a big crack across the front/side. They also have been leaking somewhere during the winter. I need to replace them, and might just end up at LL Bean this time around.
Contact them. The same thing happened to mine. I contacted them explaining the situation and they responded with "send us a picture via email and we will send you out another pair." they sent out another pair and I had them within a week. Kamik did state that they had put too much silicone(?) in the bottom part of the boots during the manufacturing process and were aware of the issue. Unfortunately, they didn't have my style anymore, but they stood behind their product 100%.