Car infested with ****roaches and serious mechanical issues not disclosed during sale!

My experience with WBC has been ********** since the day of purchase of the vehicle. I bought a category A car on finance at the Riverhorse branch of WBC but when I drove out the car was already leaking water. When I called the salesperson he told me it was nothing to worry about, it came from the aircon. As if this was not already enough for day 1 of having the car, it was also dirty and infested with ****roaches which they somehow managed to distract me from in the inspection. These ****roaches continued to come out from mainly the sunroof of the car and these took weeks to completely get rid of them. 3 days after collecting the car, it alerted me that the brakes were due, which I replaced. Not long after replacing the brakes, the car started overheating continuously. I informed them about all these events and let them know that I needed to return the car but they suggested I claim the repairs from the warranty, they would not pay for the repairs - bear in mind all these events took place in a space of one month only and none of them were disclosed in the Dekra report. The Dekra report showed that all was in order with the car. They have since collected the car and have completely left me in the dark about what happening, they say they didn't know they had received the car, what a negligent business! This is a car I have paid installment and insurance only for it to sit the the WBC branch.