^ According to the confirmation email I got:

HELP: Visit http://store.johnmayer.com/store/ or e-mail orders@echomusic.com
for help related to your order.

And then when I searched the website for a phone number, it said they do not have a customer care number, but you can use this online form:
http://store.johnmayer.com/customercare/store/storeform

I hope you get it all sorted out!