If your car is still squeaking, get them to check your crank pulley... I've heard there were a batch of vehicles (even though mine is a 2010) that had serpentine belt failures due to shoddy materials... my squeak got progressively worse, starting with happening just at cold start... to it being there every second the motor was turning... they replaced my v-belt and tensioners 3 times (as there were 3 belts that super-ceded each failed one before)... to no avail, my crank pulley was eventually replaced... and I have no squeak!