Sold a car that has a problem

We bought a Mercedez Benz on the 30th of December 2015. The car started shaking when it gets to 120klm. Took it back and they took it in their workshop and they say they've found 2 problems with a vehicle. Now,we without a car and we are stranded. How was I sold a car that had problems? Now,I missed important events to attend because I was sold a s**** car with only 27890k's. We hate mercedez benz already and we regret ever doing business with that company.