Bought a car that was in a accident without knowin

Good day<br> Four months ago i bought a pre owned vehicle at NTT Paarl Volkswagen, was very happy car looked excellent so i was very excited, so the following happened on the day when went to collect the car i saw the car driving past me to go get fuel thrown into it i noticed the right rear light was not on it i was shocked so they told me the original one was cracked so they replaced with another one taken from a car at the garage shocking, further more during my 1st week with the car i picked up the car had an oil leak, a month down the line the engine jerked and plugs needed to be replaced and if thats not enough now recently i've been told the car was in a accident and this is being said only after i recently saw my heatgage light appearing warning me the car uses water today they said the radiator needs to be replaced R12000 plus really? I have motor warranty but they say it doesnt cover it because of the accident damage was the reason this happened i mean really now was it me who made the accident? NO and why say you dont sell vehicles that has been in an accident when you do? I need help and soon i refuse to pay for this damage and want to get rid of this car