Assist with an unfair matter

I bought a car at this dealership on 12.06.2021 within a week the car was giving me issues with the engine were it was misfiring due to coils the problem was then fixed but I was still awaiting for other new coils, the car was fine from the mechanic. 30 july the car had an engine break down and the whole engine had to be taken out and buy a new engine. They had agreed that they will help now that we got a quote for a new engine they refuse to help me out. Please assist me with the matter.