Brand new car giving problems

I bought a brand new I20 last year April in 8 months time it stated giving me problems firstly the key stucked in ignition, secondly the pulley comes out and the belt comes off I took it to Tzaneen branch they made me pay for the amount of R987.00 but the car is still under warranty, now it overheated but water and oil was there I took it to Alberton Hyundai they can't fix the car for 1 month full now that car is not right I phoned the Head office I get no help until today I'm very much disappointed with this brand