2007 toyota camry xle

We have a 2007 toyota camry xle that we are having problems with. We were told that
it was the alternator and the battery bc the car would not start, all of the the warning
lights on the dash come on, and the headlights would not work so we had the
alternator replaced, alternator belt replaced, as well as the battery replaced. Now the
car starts up just fine but all of the warning lights still stay on, and the
blinker/headlights still don't want to work. Someone please help!!!