Purchased a car and it delayed engen light almost 3 months not yet fixed.

I have purchased a car from this dealer. it gave me a problem in 1 day, i took the car back to the dealer, they referred by car to none mechanics, The car delayed Engen Light even today. it is almost 3 month now. It the dealer manager imy is full of lies, he avoid calls, the service is just bad. to date i don't have the car. they are busy claiming that they are fixing the car but still no answer. we took the car to volvo and the results said they tempered with the odometer. no good service at at deal at all.