vehicle sold without disclosure of previous accide

I bought a 2009 vw polo from pmb auto sales on 29 september and i have been having endless hasstles and wastes of money on this car only to find out when i tried selling it 5 months later i was told the cars value is only a half of what i paid as it was in accidents totaling in 70 000, i was not made aware of this when i bought the car, if i was made aware of this i would not have taken the vehicle, i took it back to the dealership and they told me there was nothing they could do, i am desperate to sort s matter out as i am losing alot of money now, please if anybody could help please contact me [Email Removed] thank you