I sent my car 1 week back for service Apparently...

there are a number of issues that may be the problem the three primary categories that you should address first are the starter and battery, fuel delivery, and ignition
To solve the problem do
1. Check the battary : if teres no click on starter that's mean dead battary ,if you can hear clicking, it may be because the starter is attempting to work but does not have enough power.
If the engine is turning over but won’t start, it likely isn’t an issue with the battery
Check the voltage of battary it must be between 12.4 to 12.7 volt
2. Check the pole of battary
3. Check the starter
4. Check all fuse
5. Check the crank sensor
6. Check the fuel and filter pump