loyal hertz customer extremely disappointed

In recent times my dad and i have been using hertz alot. Hired from hertz king shaka just recently and received An Old Shape Chevy Spark which looked not so clean inside and a bit high mileage. Yet your vehicle guide has a Picture of the new shape. Now I have a booking again this Saturday for the same group from the same branch. I phoned them today and was told that they only keep the old shape chevy spark and have no i 10 ' s or kia picanto anymore. Why put a pic of the new shape on your vehicle guide. At least with budget they only keep the new shape spark. My dad has an upcoming booking in Cape Town next month. I plan to use hertz again for 2 bookings in Dec. Give me one goof reason why I should remain with hertz when u deliver an inferior car with false advertising.