I hate to say this but your experiences are an all too familar story..
Could you list the part numbers and description of labour on your renault service receipt please..
In the meantime here
is a post in our knowledge base which is attempting to solve the somewhat common problem of a drive wire failure giving Mr Renault Dealer a licence to charge the unsuspecting Renault owner £310 - ish of their hard earned cash..
Renault Service - It's like fecking legalised criminality IMHO !! Dishonest !!