Battery is dead car doesnt turn on,car totally dead

Have you tried to jump start or charge the battery? If you pull the battery out, most large parts stores offer a free quick charge. They can also do a free battery condition check. Start there and let me know what happens after battery is charged and checked.

First remove the battery and have it tested.
If the battery after being charged and checked works then re-install and your safest way is to take it to a shop because of the many computer and other sensitive electronics. Let a pro check it out - a 2007 might even have a recall on it. To check for recalls - simply take down your vin number - then call the local dealer and ask. If you think the dealer isn't honest - call several dealers of the Pontiac