A car I drove for 30 minutes

I bought a car on the 16th of January 2025 from WE BUY CARS, which I drove for 30 minutes then the engine SIEZED. I told them that I would like to cancel the agreement on the 21st of January 2025 after their workshop told me that the engine seized. However they don't want to help me because I refused to opt for another car from their floor. Now I have to pay the bank and insurances for a car I drove for 30 minutes. We Buy Cars has grown arrogant and it's not the same We Buy Cars I bought a vehicle from during 2015.