Steering Nowhere!

We have 8 Peugeot 207's in our fleet. All with same mileage + or -. This range from 120 000km to about <br> 180 000km. So far these vehicles have performed faultless. One has now suddenly developed a problem with the power steering. The vehicle started to misfire, at the same time the power steering would fail intermittendly. The misfire was fixed by Peugeot, but now the power steering has failed completely and we are told the steering system is shot and needs to be replaced at a cost of R19 000!! This vehicle is 3 years old, travels only on tar roads and mainly on highways! How the heck can the steering system be worn? Peugeot SA does not want to listen to our problem and give us a deaf ear! Is this the way to treat such a loyal customer?