Poor service

My cars battery started to gave problems Stage 5 lock down. A technician come out to start the car. That happened 3 time. I phoned mercedes on call. They said I can take my car to any dealer for the battery to be replaced, without an appointment. I went to Menlyn, they said I have to book it for a service and that they can not help me. Only in two weeks time. I made an appointment with Centurion for the battery to be replace. I phone to cancel appointment due to the fact that they cant let the driver take me to work. The lady said she will phone me back to reschedule. Since then I left 3 messages to phone me back. Monday I tried to phone but the phone was just ringing. I cant drive with my car almost for three weeks now. My dad phoned Volkswagen they helped him in 2 days....