Used far passed as Demo Care

I purchased a car from IMERIAL SELECT PRETORIA NORTH which was supposed to be a DEMO only to find out that it was actually a PREVIOUSLY OWNED vehicle which was also involved in an accident and i only found out after purchase. The second thing is It was never taken for a ROADWORTHY check thus i was involved in a terrible accident. I was helped by a gentleman called Darius Ferreira and a lady called Yolandi. I mentioned my unsatisfactorily but nothing was done about my situation. I currently work for an IMPERIAL company and never got the discount. I Do not want to involve legal aid in this instance i would like a new car or compensation.