Worst Car Service Ever !!!

Took my car in for service got it back and it didnt start they had to kick start it. drove out went shopping when I came to the car it wouldnt start. I was stranded called them and they told me they will have to charge for a call out. When i brought the car back I was told my battery is more than two years, its old, before any investigation commenced. My car would have alerted me if my battery was low. I was told the battery cell died and I must buy a new battery at this point my airbag is flashing. Went and got the battery now I must go back for the airbag checked. To take a car for service and have it come back with it not starting and incurring more cost is more than a nightmare!! I am livid !