Poor manufacturing on Toyota Hilux Extra Cab.

I bought a brand new 2.4 Hilux Extra Cab, after one month we noticed that the loadbin was causing damage to the cab. I was told by the dealer in Howick that Toyota was aware of the manufacturing fault and that the vehicle will need to be repaired. I'm not happy with this outcome as Toyota was aware of this manufacturing mistake, they did not even consider contacting me to inform me of a bulletin that was out for repairs to be done. They rather waited for a complain to arise. Now this new vehicle will need to go to a panel beater for repairs. I want this vehicle to be replaced with a new one, had I know that these extra cabs had problems I would never have bought one. Toyota KNOWINGLY sold this new faulty vehicle!!!!! My first Toyota and the LAST, Pathetic service form a big company, their staff it not willing to entertain my issue, I have reached a dead-end and cannot speak to anyone beyond customer care.