Was the charger the correct one for your phone? If not you may have fried/damaged the battery.

When you say you've had the phone for a month, do you mean it is a brand new phone? If so I'd send it back under warranty.

 

If I were you I'd get your own charger back and hopefully your phone will charge ok again.

Using a different charger is not a good idea, especially if you don't know how it's been used or looked after. It may have different specs, or even be faulty.

 

yes not all chargers are teh same and some can actually damage your phone, either go to Metropcs and buy a new one or go to your"Friends" and get your old one. Oh, and as a side note do not take it with you again, use the USB plug from a computer with the cable, I have teh charger but i keep mine charged with the comp all the time

 

My AC phone charger started making a strange noise..now only charge with phone when I have to.

Not all chargers are the same, third party chargers should NEVER be used, use whatever it came with in the box.

Its possible you fried the battery, as mentioned, which would force your option to go back to metro under warranty, again already mentioned.

Never swap chargers for any reason whatsoever.