vw tiguan

i bought a brand new vw tiguan R line1.4 comfort line 2017 model last year at vw Acadia week after i had a problem with fuel consumption of the car as from full tank to half tank it consume a lot, i took the car back to the dealer to be checked it but the advice i got was to , i have to put half tank all the times , then a months the car refuse to start one morning i raise the issue and i was told i left the radio on for which it was not true.

on the 5th April 2018 while i was on my way from home on N1 between Polokwane and Louise trichard driving at a speed of 120k/h it open the bonnet athe car was towed back to the dealer were it took two months and i was paying for it. they st******* the part and send them to vw south Africa from there to Germany for inspection. mid may i got a call from vw south Africa informing me that all parts sent to them are faulty and they will replace all of them and give me the car back, i ask them to replace the car as it is no longer safe for me they refuse. i ask for the report about the cause of the problem they dont want to hand it over to me.

on Sunday 24 June 2018 , i was driving at the speed of 80 - 100km/h the car gave me two warning from there it cuts off the ,switched off and lock the steering wheel while am driving, i took the car back still they cant see the cause of the problem

i tried all i can with the dealer principal, sale manager C, service manager , and also Vw south Africa but no help from them. i ask wv finance to assist me on this matter but still struggling