Extreme body rust and welding falling off

Shocked to find a horrible deep rust spot on my 6-month old duster. And when I go to look around the car, found the weld fallen off from one of the doors. Would you expect this from the Renault ??? I have taken the car to the service centre and they booked a complaint. Then they suggested that I get the car for repair. I will not accept a touch up job for sure. I may have a rust bucket with touch ups all over very soon. Now they have taken the car, and have it there for 5 days while I try to find my way around without a car (very inconvenienced). They say they will touch it up to Renault standards. I have asked for the copy of the standards. Also I have asked for an extended warranty for 10 years as I cannot be driving around a rusty car after the end of the present warranty. Also need then to provide a service car whilst the work is being done.

Unable to upload the images, but they will make any car owner cry!!

Thought it would be goodExtreme body rust, welding falling off