Terrible service

I dropped off my vehicle on the 28th of January and til today my car is not back. I was dealing with a different consultant and then was passed on to Kary after that consultant left. Kary was of no use whatsoever, she has no once kept me informed of the progress on my car. She would actively avoid taking my calls and it was very clear that the receptionist was covering for her. After fighting for months for my car to be finished I physically went to their offices last week Friday and demanded my vehicle. I was told it would ready by tomorrow. Kary once again made promises, none of which she kept. When I arrived to pick up car yesterday it was still not ready. I was told to wait 2 hrs and it would be done. When I took the vehicle and as I was driving on the N3 the vehicle went dead, the battery was completely flat, even the hazard lights wouldn't flash. I was almost in a accident with another vehicle as the car just came to a dead stop in the middle of the freeway. I called Technostar and the receptionist said someone would call me back. And despite calling twice and explaining to her the safety issue I was faced with no one bothered to call me back. I then called Miway who sent someone to jump start the car and I drove it back to Technostar. A "check airbag" light also came on as I was driving back and the vehicle kept making a beeping noise. Now I'm being told that I need to buy a new battery which I flat out refused to do. This is a brand new vehicle so the battery was perfectly fine when it was dropped off. It is not my fault that the vehicle was parked at their premises for 4 months til the battery was completely drained. I have dealt with other repair companies before and I have never received such terrible service in my whole life! I am beyond fed up with Technostar they do not have any customer service whatsoever. I just my car back in perfect working order and I never want to deal with Technostar ever again.