Poor Service Hyundai South Africa and Hyundai Beacon Bay East London

I took my car for service it came back not starting at first attempt but would start on the second attempt. I took it back two days later and I was advised that the valve was not properly closed. My boot started randomly opening and I would close it but it would still open, or it does not open completely. I raised it with them after a while the manager denied the fact that when my car would not start because of the valve that was not properly closed. 3 days later when I was putting on petrol I was advised by a petrol attended that my car is leaking petrol, when i called them i was advised to take the car to Hyundai while its leaking petrol, I said never what if it catches fire and they sent someone who told me that the petrol tank was not properly sealed. Basically Hyundai Beacon Bay in East London failed to perform a proper service on my car and now I am stuck with a boot that wont open, which started after their poor service. I raised it with Hyundai South Africa and they referred the matter back in EL the same people that were not willing to take accountability for their poor service.