Transferring blame/responsibility for poor service/product

You know the saying, "it's all good until it isn't". As a long-standing customer of BTW Midrand, I recently had cause to purchase some rubber from them, namely, X1 racing cut slick rear, X2 Pirelli MT60's (front & rear) and X2 Kenda pitbike/scooter (front & rear) hoops. Succinctly the following: cut slick, brand new and fitted well (to rim I provided). Pirelli MT 60 rear, old dull, dusted tyre, sold as 'brand new' to rim I provided. Tyre loses air while bike is on paddock stands (bike never used with 'new' tyre - owner says, possibly a puncture ... try figure that one out). Scooter tyres, rear rim damaged, trying to lever tyre off rim, despite my informing staff of need to 'split rim'. Upon enquiry, (only about the rear Pirelli losing air, mind you) owner responds with a patronising e-mail, never pausing to investigate my circumstances regarding the purchases, my track record with BTW Midrand, or recent purchase history, with his understudy. My business, ladies and gents will be taken to a service provider who knows something about, and appreciates, customer support.