Go to TGM or Performance Autoworks. Both aren't too far from you. Or a trip over to Area.
Did you buy it from a dealer? If so they have to come with a 3 month warranty and must be fit for purpose. That might help?
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Get the work done at a specialist. Clutch is wear and tear so just grin and bear it. However, as you have warranty for the box. If it does need a refurb then ask the garage to do out a second receipt for the box work and take Drive Away to small claims to recover the cost.
Not a knackered gearbox then? :lol: