Maemo Motors Rustenburg

We bought a brand new Mercedes Benz at Maemo motors Rustenburg the car was delivered on the 20th of October 2018 the car started giving problem on the 19th of October till today 21th of October 2018.Every morning when you start the car the engine light comes on the engine start shaking we contacted the sales person by the name of Robert saying we are bringing the car back as the car it was only 4000kms when i arrived he took me to the service advisor saying he will help me as he knew the problem and he left me as the service advisor was busy with another client when he was done i told him my story and he was not willingly to help and I went back to Robert gave him the car keys and told him I'm leaving the car they will hear from the media about the service they are giving to people that's when the manager interfered saying they will book the car for service my question is how can you book a brand new car for service?I would also take this up with Mercedes Benz South Africa now im stuck here had to call someone 100kms from home to come fetch me and take me home im very disappointed with Maemo Motors Rustenburg