Rather than having the usual Birki smoother footpad, this Birkenstock has a built in RIGID  &#34;Foot RIDGE&#34; that is VERY uncomfortable and annoying for my  crooked big toes!<br /> i.e. one shape does not form fit all feet!  WTF - Why This Form? -  It's going back!! sorry, i will have to stick to Birkis!<br /><br />How do I do the exchange process?