WDP Cars poor service

I bought a vehicle at WDP cars after 2 days of having the vehicle it started giving engine problems.the vehicle went in multiple times for fixing.this has been going on for 3 months and the problem is still not resolved. they are saying they have fixet it but this is untrue because the stuff that they replace have not resolved the problem and now saying it is a new unforseen problem but the vehicle is still giving the same problems and now they are ignoring to fix the vehicle saying i must fix it myself trough my warranty that is not reasonable because i received the vehicle in this state and was never in good state