Kia Sorento 59 plate Turbo problems

I have a 59 plate Kia Sorento and while on holiday in France the turbo went. Before I went to France I took the car to the Kia dealer for a recall to down rate the turbo. When I received the car back there was a whistling noise. I took the car back and they reported no problems. I then noticed another associated noise and reported this and again they had the car back and reported no problems. In France the turbo blew and caused me no end of hassle. After my holiday I went back to the garage and they have basically said that when the car left them there were no issues. Anyway I refused to leave and eventually they a agreed a 1 hours diagnostic check.  I have been in touch with Kia customer services and they have muted  that they may be willing to offer a goodwill gesture, whatever that means. The car had a 12 months warranty from the garage I originally bought the car from. This has now run out, but the problems were reported before the warranty run out.The car in now back at the Kia garage and I would appreciate some advice of my next move. 

Regards

Bill