First Car Rental Poor Service

Today I went to First Car Rental Kempton Park to collect a car. My insurance booked a car for me with First Car Rental, and I called them to arrange for the car pick up. I indicated to the lady that answered the phone that I needed an automatic car, and she asked me to hold while she checks availability. she came back and confirm the automatic car is available and I can come at 12:30 to collect it. I went there as per the agreed time and found the guy's name Zakhele who just intervened while the lady was trying to help me shouting there is no automatic car available. I tried to explain to him that I called before, and I was advised the automatic car was available. He did not want to listen but shouted at me and says your insurance has booked you a manual car and we cannot change it. It is your insurance fault, and he was rude. This guy lacks customer service and is destroying the business and he must be fired. He is useless costing the company business. It was so bad that I had to contact my insurance and ask them to cancel the booking and change it to Avis and guess what, I got an excellent service at Avis even though it was short notice. I recommend Avis for their superior customer service. I don't know how many businesses First Car Rental has lost or will lose because of this guy Zakhele if they don't fire him. He does not understand the impact of his actions to the business.