I have recently been training in Katanas. I've put in about 70 miles in them the past week, and the air bladder in the sole popped. It lets air out slowly when I step on them, and when i take my weight off, air seeps back in. I ordered them from Eastbay. Is there something I could do to get some credit or something similar. Also, I really liked these flats, does anyone recommend something similar that wont break as easily.