Rejected refund

I purchased a clutch plate at Goldwagen Arcadia in East London in late January 2015, when it was fitted in my BMW E90 it didn't work and the mechanic advised that I should go straight to BMW and get the Original there. The following day I returned it and was told it will be sent first to \technicians"and had to wait. \""Technicians\"" who came back saying they can't refund me because of a scratch "