petrol attendant didnt close my bonet of car!

Good day<br> On 17 april 2015.i went too bp garage wine route klapmuts in paarl too throw in petrol on my way too goudini spa in worcester.the petrol attended didnt close my bonet of my toyota tazz properly.as i got on the n1 the bonet flew upwards.we almost died.my bonet is damaged as well.as the roof of my car.i phne the bp garage i told them what happen.the incident happened between approx from 15:20 -16:00 im nt sure of time but we bought 5pies in their shop and 2 2lts coke.we still ate infront of the shop.incident happen 16:00 on the n1.when i phne the garage they said they will look on surveilance camera too spot my car. I had too phne back because nobody came back too me.a sidwell told me he was still looking too spot my car.i phned back at pass 6 he didnt return my call.wht will happen too my car now.bad service.im still waiting.its saturday no returned calls.my car is damage.it wasnt my fault.