i have purchased both an iPhone 6 and a Mac book gold edition and I never got any free pair of headphones with either device.
If you are in the United States, here is Apple's Terms and Conditions sheet for these headphones. Do you meet all the criteria stated?
http://images.apple.com/promo/pdf/US_Summer_Beats_2016_TCs.pdf
You have to be a student and have student ID to get this offer, you need to order through the Apple Education site and verify your student status on the site and the offer will applied in the basket.
you should be in the United States in order to take this benefit. I bought a MBA for its educational program and got a free Beat Headphone. First, I intended to wait for the next macbook air coming out. After seeing its advertisement, I decided to order one .
Free Beats headphones?
