Ford Focus - Garage charges - Spoolbox

I was told by my garage that I needed a replacement gearbox so I asked them to supply one and fit it they put one in and found out the was a fault (2nd gear wasn't right so they are looking for another one my question is can they charge me labor costs for putting in the faulty one and taking it back out I don't think they can as the provided the gearbox but I just want to make sure will be grateful for any advice

Ford Focus - Garage charges - Andrew-T

Well, I suppose they might, but they shouldn't, as (if their report is genuine) they can pass the buck to whoever supplied a faulty 'new' gearbox. You should credit them with testing it before handing the car back, and being honest. Maybe they aren't pushed for work, and are forestalling you coming back to bang on their desk ?