Ultra Poor Service from Travelstart and Car Trawler

I booked an entry level car for pick up at OR Tambo in my mobile phone. I was looking for the option with zero excess payable. Their booking process for car hire Car Trawler was tedious and rather confusing. All seemed in order. I got to OR Tambo and was asked for a R23k deposit on ky credit card. If I had that kind of money I certainly would not be hiring an entry level car. I was directed to Sixt at the airport. The lady tried to assist me by calling a cal centren in the East. The repeesentative on the other end could not umderstand us. The call was cut and again we tried to fix this. After an hour of teying to resolve this. I went to Avis and hired a car with relative ease, zero excess and only a R2500 deposit required. What a pleasure. Travelstart refuses to assist me to obtain a refund yet I made a booking via them. Car trawler jas declined to give me a redund of my money. This is just not right. I am paying for a service I have not received. This is terrible. The whole experience was terrible. I will never utilise their service again!