Re: the Sigma Kappa shoes, I sent them a friendly note:
"You used Kappa Sigma (a fraternity) colors and symbols for the Sigma Kappa sorority shoes. Are you sure you're an "official" licensed vendor?"
I actually got a quick response: "Thank you so much for making us aware of this error! We really*appreciate*it!

"
I give them credit for being so polite to my snarky note!