Bad customer service mercedez menlyn

My car had a battery issue so it said. I took it in and 4 days later am waiting for fix approval. The receptionist won't even allow me to speak to the service manager to get answers. I emailed, called. His name is Kevin at Menlyn Mercedez. He wont even respond to a phone call and my car has a warranty but i am taken from pillar to post. Service is bad.