Damaged vehicle from Webuycars

I bought a car Ford fiesta 2015 year model on the 18 January buy 19 January following day it was showing engine sign I contacted the salesman they came to pick it up it came back fine, until the 28 July barely six months it started showing the signs again and more and could feel that there was no power, I took it to the workshop and the quote was R29 000 of which the warranty is willing to pay R8000, I took the car because I couldn’t afford it I cannot even start the car as I type this and it is a financed car I cannot even get rid of it and they not willing to assist. Kindly intervene Hello Peter this matter is depressing as I pay for a car that I don’t even have.