hi and welcome to the forum
check all your paperwork!
get in touch with Renault UK customer services to establish what warranty you have and liabilities on such costs if any with repairs. if there is warranty on the car they will contact the dealership(of your choice!) and tell them to do the repair without charge on a repair order code issued by them.
if the local dealership is being difficult (there are web pages online with some pretty daming reports on practices by some dealerships, who are not interested in aftermarket customer service unless they are making additional profit out of customers, hopefully those dealerships will be among the ones being cut from the franchise chain this next year.)
you may-well/should be able to take the car to another dealership for repairs to be completed.
not all dealerships are equal, some will bend over backwards to keep the customer happy, my local ones in east anglia certainly do.
do keep records of what was discussed incase you have to escalate the problem to trading standards.
snippit from a cliosport forum:
Please call our freephone number to speak to a Customer Services consultant on 08000 72 33 72
Alternatively, please write to:
Renault UK Ltd
The Rivers Office Park
there is also Renault Service Advisor that is a member on here that can escilate any problems you may have.
Im sure some other more senior members can give better advice, one is bound to be along shortly.