How can I burn out 2 clutches???

My Renault 2009 4 x 2 Koleos had a clutch replaced a year ago because it burned out. The new clutch 8 months ago started to shudder. I informed the dealer at my 30000km service to check the clutch but they advise there is no problem. This problem continued at 60000km service I once again informed the dealer that my clutch still has a problem and to check it out. They said the clutch is fine and bedded it. In this month my clutch really started to go bad, smelling burning slipping on up hill to the point that I can not drive the vechile. I took it to the dealer and they advise that they are to busy with other repairs and can not get to my car till Monday, well my car could not wait till monday as i need a car every day.!! this do not forget is a brand new clutch that was replaced a year and a half ago!!!! What on earth must I do with this car!!!!