You might want to describe how you intend to use the MacBook, as that would help us steer you to the best solution for your needs.
For example, if you need dual external monitor support, then the MacBook Air is NOT the way to go...you'll need to move up to the 14" or 16" MacBook Pro for that.
If your needs involve a lot of high resolution video editing, then I'd suggest the MacBook Pro.
But if your needs involve common web browsing, email, photo editing, word processing, etc.....then the MacBook Air would be just fine. (Hope yours has 16GB of RAM, though, if you're doing any photo processing).
If you bought your MacBook Air in the US, you have a 14 day "grace period" in which to return it for a full refund. I don't know what the policies are for other countries, though.