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Or, as it's genuine Renault parts, the warranty of faulty parts is with them. Tow it there, pay for them to strip it down and if it's faulty parts they'll cover the costs. If it's faulty workmanship they'll tell you.
Not what you've described. IMO he hasn't a clue what he's doing with them. Where are you based? Get it taken to a specialist who will confirm/deny any wrong doing of the garage.
Little update.
Had help from @Stopherson and @Richy182. was doing bits on his build, me and Chris set about doing my clutch.
Box out:
New friction plate:
And now we can run 2bar of boost