Geico Fixed the outside of my car and made me pay for a lemon chandler Arizona

I was run off the Interstate at 75 mile an hour. Thankfully my child and I are alive. Geico appeared to be doing the right thing by me, and I thought wow...WRONG! There was a horrible knocking in my engine, and I was afraid to drive it. When I got my vehicle back it looked great, I gave them 500 dollars for the deductible, although the OTHER driver a semi truck was sited and listed at fault. I was given nothing in return but a shell of a vehicle. I said it still knocks, and they FLAT lied to my face and said they called my husband and he said it was always knocking? What? I said I don't know anything about that! I know it was not, and that we had just had the vehicle repaired. I even had shown them reciepts!!! I was furious, went home told my husband, and he said they are shisters and NEVER EVER talked to him or called him. He would love to hear a recording of his voice because it never happened. Now there are 3 blown cylinders that were not there before! They claim we let the oil run low. Lie my husband was very conscience of this and changed it frequently, and even on the last dignostic there shows NOTHING of any bad cylinders. Furious is an understatement!