I just bought a google play card for a friend but he has an iphone?

So i just recently bought a google play card for a friend but i just realized he has an iphone. I haven't used any money on it so i was wondering if i can return it or if i can buy an itunes card with the google play card. I tried emailing gamestop, the company i bought the card from, and they haven't responded even after 36 minutes. What should i do?

You should wait more than 36 minutes…