Bad service

I'm not happy with the service I received at Mitsubishi Rustenburg and their head office. I took my car for a service on 26 February and they never called me regarding issues with the car,I called them to ask if the car is ready for collection and they said yes, after a day I tried to start the car n it was not starting, I googled what can b the issue and found that it is the battery, they could not pick up the car need a new battery during service? And is still under warranty, after 4 days they called me and asked me if I'm aware that there are issues in the car which I refused them to repair, I asked them what are the issues and the lady said I must speak to Morne, I tried calling him but he never picked up the phone, the other lady picked n said he is busy with a customer he will call me back n she took my number, even today I haven't received a call from him.I reported the issue to Head office on Saturday and today it's Tuesday no call.The last two services I asked Morne to replace the windscreen washer tube and the inside light bulb and it has not happened but it appears on the invoice