ABSOLUTELY BAD BAD SERVICE!!!

i bought a car from this company and as i drove out the premises, a sound started on the front right wheel. i called and informed the sales person and he said it will go away as the car has been sitting for a longtime. 4 weeks after the petrol filter stuck on my way from limpopo. the next day i went to get it fixed and i was told there the car has never been serviced, contrary to what i was told. i drove to the free state, bethlehem and let them know about the matter. they booked a service for at diesel electrical (Bosch). they did the service and give me a list of the things they changed. a week later the car showed that it does not have oil. i wondered as the car has just done service. i went back to Bosch to tell them and they then check the car and show me that the engine is blowing out the oil instead. the machenic told me that it should not do like that. that is when it clicked on me that by the time i was driving to limpopo, i had to stop at the garage to fill the oil but i did not take it serious as i am not a mechanic. when i send the dealer the mail to tell them about this they say they have done full quality check and full service so i must go to Bosch. in my opinion i think they never did any check in the car before they sell it to me, otherwise i should not have stuck on the way from limpopo, i should not have filled oil at the garage, i should not have went for service at Bosch. i want this company to please fix this car fully and take it to the proper dealer preferably BMW themselves and everything need to be checked. i am not happy and i was told that this is a reputable dealer!!!!