I feel for you.
Had you been a customer of mine, I would have rectified this asap but then, I would never have fitted a National brand of clutch!
I'll only fit LUK, Sachs, AP/Borg & Beck clutches.
As for any recourse now, it may be a little too late & I can only speak for myself regarding honouring warranties.
I do hope you get this sorted though.
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