its generally though lack of knowledge.
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I would be taking the working and good parts back and demanding a refund and explanation, depending on how that conversation went would be the deciding factor on whether to continue with that mechanic or find a better one.
As far as selling, that is a tough one, great cars but with LR niggles they do give you the ****s some times which in today's age build quality should be as good as any other brand but sadly that is still not the case so only you can make that choice