My iPhone 4 just died. How do I fix it?

So my Iphone 4 was on low battery and i decided to charge it. Every charger i tried, official apple chargers and unofficial chargers, came up with "This accessory may not be supported. Eventually the battery died and i put it on charge and it said it was charging.

Even after waiting a couple of hours, it still showed the dead battery symbol. I put it on over night and yet when i woke up the battery was still dead as it showed the dead battery sign. I plugged it into iTunes yet iTunes doesn't recognize it.

I tried doing a reset but my home button doesn't work so thats not possible. I tried plugging it into my computer for an hour but still it says the battery is dead. I then opened it up, disconnected and connected the battery and... nothing.

Well now the phone shows only a black screen, isn't recognized by iTunes and no matter how much i charge it, doesn't seem to turn on or work, even when i press the power button or hold it down. Any help?