ok so here is the situation. i bought a pair of birkenstocks from happyfeet. they were a real good price and i had been wanting a pair for quite some time. i've been wearing them for about a month now and they are killing my feet. my feet hurt so bad after i take them off and my heel throbs something aweful while im wearing them.

they are used so i cant take them back, but i cant wear them either. i was wanting to contact birkenstock directly about this but i wasnt sure if that would be much use or what i should even say

any suggestions?