A MECH £ 78.00 = 1 hours labour ??
X R82 00 000 938 WINDOW REG RHF L2 £186.15 EACH =
Part Number for Window Regulator Right Hand Front for Laguna II
Now then this is the renault standard charge for what is ( to my mind ) a commonly failing part..
I have owned several Renaults for long periods of time but never had a wire snap due to rust. Can I suggest you write to
Renault Customer services
to make a complaint about the way you have been treated + also the fact that this is a common complaint.
Also did you read my info about the regulator failures ?