No responsibility between Big Boy supplier and dealership

Awful! Bought a brand new Big Boy Revival 150 s****** from Mohammed at Wierda Park branch. S****** had disconnected light on delivery and broke down 5 times next to road. Two of these times directly after service. After last service air filter was cleaned in stead of replaced but charged at replaced rate. Bolts were missing from brakes, and s****** came back with speedometer broken. Phoned and emailed Big Boy Head Office they said it's a dealership problem although the s****** is under warranty. Paid R900 for last 3000km service. ..s****** broke down again. ..dealership refused to give reason. Looks like problem on s****** which now has been in for repairs 7 times since it was bought in May. Highly disgusted that between Big Boy and dealership no one takes responsibility. Last conversation with Big Boy they said I had to take it up with the dealership who can simply not be trusted. Why does Big Boy give a warranty that they try and get out of?