Street Style Store — unable to exchange product

I've received my product today. I've been trying to place an exchange order since this morning but i'm unable to do it. I thought i'd get a contact number through the website but i couldn't find that either. It's order no. 1947389. I ordered size 36 but it doesn't fit me well so i logged in and went ahead to try to exchange it with a size 37 product according to the mentioned procedure. But instead of the "replace" option i'm getting a "reorder" option which requires me to pay again. It's really disappointing.