Worst Service Ever

I bought my first ever car in Nov 2014, it was a second hand ford fiesta 1.6, The car had a few problems but hyundai said they will get it fix. * Engine Light was on, tappet cover was leaking, car didn't start properly * finally only in Jan 2015 i got my car so to say. Drove with it and last week Thursday 21 May 2015 my car broke down, took my car to Ford and they inspected it... my tappet cover was still leaking, my gasket i had to replace and my head gasket needs replacement as well... now according to hyundai my tappet cover was replaced but then why was it still leaking... now i need to pay a enormous amount of money for something that was suppose to be fixed in the first place... who is liable for that now Hyundai Roodepoort or the Outsource company they use to service second hand cars that's not hyundai... so unhappy with this whole situation and definitely wont buy a car from hyundai roodepoort or any hyundai branch what so ever...