Ford Mustang won't start, battery and alternator are fine...what could it be?
So 3 times in the last 2 days, my car has needed a jumpstart. Took it to pepboys and they told me to replace the battery, a new battery later, my car wouldn't start again and I needed to get it jumpstarted again. Took it back to pepboys, they say everything checks out fine including the battery and the alternator and that it should work fine. This happens to be exactly what they said the last time.
Now the extent of my knowledge ends here, so I'm looking for suggestions on what it could be, what to do or any other advise you could offer. This is my first car so not greatly experienced with cars.
The car is a 2012 Ford Mustang V6 convertible.