Faulty car

In November of 2014 I purchased a vehicle from Mercedes Benz Santon for business purposes, in December we discovered that the engine was faulty, the car was taken in for repairs. It was discovered the very next day that the faults were not fixed and the dealership ask us to bring the car in January 2015. When the car was taken back in Jan the dealership refused to fix the car wamting to charge us for repairs, after a week that they had the car on their premises and a lot of arguing did Mr Michaels notify that they will work on the car. The dealership has now had the car for two weeks, I have not been updated on the progress despite having called on three occassions leaving messages for Trevino and Shaun. This has resulted in loss of income and has left a very bad taste in my mouth. I doubt I will ever my another Benz.