Very unhappy about the service of my vehicle

I took my car for a service i live far away from Kimberley. 2 weeks later i smell something is wrong and see the smokeyness at my headlights and only then i saw they never put the oil cap back on. I reported it and it was investigated just to tell me they wont take the responsibility....i meen seriously thats all you needed to do i dont want anything but atleast an apoligy from them. I asked the customer consultant does she think for one second that i would waste my money to drive so far...pay so much for the service on my car and then i would delibratly do this myself?? I was and still are very upset because this car cost me alot of money. Who on earth opens up their hood to check or change anything if the car was just services...really? So now my cars engine is also full of oil and they want me to be responsible. I feel they didnt even have the humanity to atleast apoligise. Will never take my car back there...thats a fact.