Regarding chargebacks you really need to be careful here. I want you to succeed with it so i'll give you as much info as possible. When and if your credit card company investigates and charge smiths engineering back. Smiths engineering CAN dispute that and actually charge your credit company back. Then your card company can re-chargeback under grounds. So what you need is proof of EVERYTHING. Invoices, discussions, emails. Your mechanic neighbour can help a great deal by being a 3rd party specialist who investigated your engine and established all old parts were used therefore showing smith'