Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
Hi Angie .
Which engine do you have fitted petrol or diesel .
Do you have the use of a diagnostic scan tool .
Does the engine crank over ...but not start.
So the starter motor is also not turning the engine .
Is the car still at the repair shop ,
So everything worked when you picked up the car .
Check and see how many volts you have at the battery with a voltmeter , a fully charged battery will have 12.6 + volts .
Then with the voltmeter still connected to the battery have a second person try and start and take note of the voltage does it drop or stay steady. stays steady replace starter motor .
If the Battery voltage is below 12 volts charge battery and then try and start ,you may just have a low charged battery
causing you this issue .
If this is the case and the engine starts with the recharged battery check the voltage at the battery with the engine running you should have around 14volts is 13.4 and lower have alternator tested .
If you need further assistance with this issue then please get back to me with the reply box below .This is not a one answer and done i/we will stay with you until the problem is sorted out .Before rating poor or bad please get back to me as i'm here to help you and if i can't i will opt out so another expert can , we want you to be happy and have your problem sorted out and be a happy motorist .After rating there is no further cost for any other question relating to this problem Kind regards Greg..