Cheap Car Rentals in Sun Valley, Los Angeles

I flew to Lax from Qatar for 16 hrs. When I reached Enterprise location there were cars available in the lot however they kept repeating to me that there was no car available. Not even a lower category class. The Enterprise staff were so rude and did not take any responsibility of the situation and did not provide an alternative solution. I even called costumer service without any help. They left me and my family out side in the hot sunny day for 4 hrs. Then, I had to wait with my suitcases and 5 children for more 4 hrs in the sun until we found a ride to the hotel. I end up spending 500 USD on Taxi on that day. I never had such bad experiences and feelings. My whole travel was effected financially and physically. Who shall take the responsibility of what happened? Thank you