Is it September yet? Did they miss the delivery date? Were you part of #TeamScheduledDelivery8/25 that I wasnt aware of? Who cares about a damn email. Nike is still fulfilling its obligation. Did I miss the fine print where they said "you'll be updated with email confirmations throughout so you dont feel lonely" message?
So you're a college student who bought $250+ pair of shoes, but now regretting it because thats a lot of booze money? Understandable, I was in college so I get it. But that just means you couldnt afford the $250+ pair of shoes to begin with, so the LOGICAL thing to do was not purchase it in the first place.
And now you're using logic and want to cancel. Do it. Don't use the sizing problem as an excuse though. At the end of the day, you can't afford it, which is understandable as a college student.