My second battery has fried. What should I do?

Three days ago, my iPhone 5 stopped being able to charge. It was still under warranty so I took it in to the Apple store and one of the guys took it to the back and replaced the battery. When I got it back, the home and power buttons weren't working. I would've complained, since they were working the last time it was on, but the dude replaced my battery for free, so I wasn't upset. Luckily, I have a self charging case so I could turn the phone on by flipping the switch on the back.

The guy told me to come back the next day and he would call and see if Apple would fix the home and power buttons for free. Unfortunatley, due to a tiny crack that I didn't even know was on my screen, they will not.

I figured, hey no big deal, I cracked my phone and rules are rules. I could live without working buttons. However, this morning I found that my iPhone would not turn on again. It will not charge with any charger, and I know that my buttons aren't working... What should I do?