How old is the car, mileage etc. If its fairly new..ie less than 3 months, id consider ringing trading standards, and renault uk about the car. They can sure advise you on what can happen, and renault uk maybe able to tell the dealer to get a shifty on.
Ive had that many issues with the 182 i have, that im getting rid of the damn thing. Over 18 warranty claims for items, over 25 jobs and maybe 6-7weeks of loss of the car. Real sorry storey and renault uk cannot help me as the car is older than one year.
The cruise control is not an essential item to the daily running of the car. You could arrange a car with the dealer etc, the sales manager etc to enable you to leave the car with them for a week or so to be fixed. Bringing the car in now and then is no good as no real time to work the thing, remember that if a part is not broken, it cant be fitted to the car. The original must be fitted back, if it can as renault wont pay for things like this as they are sent back to renault, not as if the dealer can throw it in the bin.
On my car ive had a new cruise control switch, and a new dash console with the cruise contol system.
I wish you well on this one, tho only time can fix this thing. You can post the question about the car on here.. see if he can help you, i highly suspect he works for renault in some form, as provided alot of info on faults to others..
http://forum.parkers.co.uk/topic.asp?TOPIC_ID=17192&whichpage=20
The inital post was in 2005, tho he updates it daily. You will need to register, tho it only takes an email address. Have a read through some of the faults people have had if you have the time, some real good info on other models.