Dude,
How long have you had the car !?!? Was none of that covered under warranty ?! Having said that my car is fortuately a company car on a maintenance inclusive contract and I reckon the leasing company have been billed for several thousand over the last 6 months with problems that have arisen....have loved it, but bloody glad that Im handing it back in 4 weeks...! I think you should write to Renualt and complain about the amount of work required considering the mileage - youd be surprised how effective a tenancious string of letters can be - a few stamps could result in some compensation...