Car loses powersteering while on their ramp

I took my Seat Leon 2.0 TDI to Kwik Fit for fitment of front shocks on 26/02/2015, my car was in driving condition when they received it and they drove it onto their ramp...otherwise they wouldn't have been able to drive it.<br> They were only supposed to fit front shocks yet somehow after fitting the shocks and wanting to take my car off their ramp my vehicle's powersteering had lost all functionality!<br> They have taken my car to various 'specialists' who have advised them that the steering rack needs to be replaced yet they continued to waste more time and resources.<br> They have also written off any amounts I would have had to pay them for the workmanship done on my car including various costs incurred from other 'specialists'<br> I am outraged that 3 weeks later I am still no further in getting my car repaired and have to make my own travel arrangements to get to work and back.<br> They refuse to fix my car at their expense as both common sense and the timeline suggest that they did something wrong while the vehicle was on their ramp??<br> I feel that they should take responsibility as it happened on their premises while they were working on my car.<br> is this fair?