You need to CALL APPLE AND ASKED TO BE TRANSFERRED TO CUSTOMER RELATIONS. They will want to hear all about what happened and want the unit back. You most likely will get a brand new unit and may get payed for any medical bills. I had a similar issue with a battery in a laptop. They will take care of you, trust me!
A similar thing happened to me in August. All of the responsibility was placed on me. The customer support was shoddy. I was actually injured and they have no regard for my health. Apple ought to be ashamed. You probably didn't get this from them, so let me say that I am sorry you had to experience this.