NHTSA Complaint #11572491 — 2018 FORD FOCUS

I purchased this vehicle from a dealer on 10/3/2022 and have had some issues, and 1/22/2023 my oil light came on and i took the car to a Tires plus who said it was a camshaft sensor, and the engine was vibrating to only have the engine light come on later. Called dealership only to find that they closed shop and you have to reach out via email/text. I was told to take to a mechanic which I then took to Jensen who said that the engine was shot, could not be fixed but would have to be replaced. I contacted the dealer again via text letting them know..I did purchase an extended warranty through the dealer and they sent out their 3rd party inspector who assessed it as the same. NOW the warranty place wants to know WHY the engine failed in order for them to repair and even in that ..they said IF what caused it falls under their' do not cover' then they will not cover it. I have contacted the loan people prior to even this, the dealer (prior to this) about issues but they kept stating that nothing was wrong along with some cosmetic issues as well that they attempted to patch up..seatbelt was not working properly so they attempted to fix but still was tight and you have to pull to get it to roll up into the slot. My vehicle is now inoperatable and I have been w/o a vehicle since the date of engine failing. I also discovered other issues that were noted after the fact that were not revealed to me at the point of sale. (yes this is a branded title, and i was informed that the vehicle was ONLY hit on drivers door but was fixed, however via the warranty company who looked up CARFAX I was informed that there was way more damange to this vehicle then I was told). I am unsure what my next step and if you can give me some options of what I should do next would be great.