Not a Renault dealer but one of my many many experiences with Perry's (this was a fault a few weeks after Perry's had to rebuild the engine under warrenty coz the piston rings and numerous other bits were f*cked)
D: One of our technicians has taken your car for a drive and we're 100% certain that the grinding is only there in 5th and 6th gear.
M: I told you the grinding was only there in 5th & 6th gear. I want to know whats causing it
D: Oh, yes, well its caused by the tracking being out and uneven tyre wear is causing it to grind like that.
M: So wouldnt I hear that noise through the gear range when the car is moving and the tone would change?
D: Yes.
M: But I dont, its only in 5th and 6th gear. A friend of mine said it might be a bearing in the gearbox.
D: Highly unlikely, we've never had a gearbox failure on one of these.
At this point some mechanic walked in from their workshop
DM: "See Andy, I told you that Turbo would be back, I bet he's complaining about the gearbox, told you we shouldve replaced it when it dropped off the tranmission jack"
Me: *Raised eyebrow look at the Service Manager* "hmmm"
D: He's joking...
DM: "Ooooooooo..." beats a hasty exit out of Service reception"
D: So shall we take it for another drive to make sure it is the tyres causing this or shall we just fit you some tyres as we think that should cure it, the tyres are £xxx
M: Here's £20, fix it for that otherwise I'll be back again with trading standards.
D: Does it have fuel in it?
M: Take £10 out of that £20, if you cant fix it for that, get another £10 fuel and set fire to the f***in thing, I dont want it back.
Fast forward to 6 months later:
M: *gets rid of the Astra and buys the 182.*
Happy ending or what?