I contacted the dealer by email so that i had proof he agreed to have it repaired, i was to drop it at his garage which is a distance from myself. I asked if he would cover these costs and he has now said he is under no obligation to uplift or repair the faults i alleged it had

Hi so 5months ago i bought a 54 plate vauxhall astra from a dealer for 2495 after a few mistakes with the finance we came to a verbal agreement to this day i have paid 1900. After leaving the garage the transmission light came on i called and he agreed to fix it so we went back up and he said it was a sensor and it had been changed again on route home the light came back on he agreed to fix this but was super eager for the final 595, i toldhim i was reluctant to pay this until the light was fixed he agreed. Now my car broke down on the bypass and after having it towed to a garage i was informed that my car has been running with an open gasket for months and my engine was now done. Looking for advice on what i should do now, where i stand, should i repair it with a new engine or leave it and try get a refund? Any advice would be appreciated thanks.