If they new there was a leaking water pump when they carried out the cambelt change , they should have told you so while they was doing the cambelt as they could have said ,look we have taken you cambelt of and we have noticed that the water pump is leaking , do you wont us to fit one for you ,then the choice was up to you ,also was it a renault dealer who carried out the repair , also who did the service they should have noticed the coolant level as that has to be checked on the service ,it looks like your car was not looked after at all , unless the fault just occured over the past few days ,.
mark
May 2008