Lexus of Towson

I have used Lexus of Towson service for 2 years. I was very pleased until this past fall when I brought my car in for regular maintenance. As usual, I had a loaner from Lexus and drove it to my home a mile away and it stayed in my garage until I left to pick up my kids at school and then went directly back to Lexus for my car. Two days AFTER the maintenance, I get a call stating that the loaner I used came back damaged on the passenger side of the car. Mr. Jim Dick (service director) stated it looked like it was hit w a basketball. I explained nothing happened. He stated his employee saw the damage as I drove into the service area and he was called and saw the car immediately. Why did it take up to 2 days to be called by Lexus about this damage? Why was I not called over to the car immediately if an employee saw it immediately and Mr. Dick saw it immediately? I spoke w Mr. Dick who stated that it didn't matter how long it took for them to reach me but that I was responsible for it anyway. Called my insurance people immediately who went to view it a few days later but it had already been "repaired." No evidence. No pictures to prove anything. Their word against mine. As far as I'm concerned, bad business. I am not being irresponsible. I don't want to be bullied by any Mr. Dick or Lexus employee. Now I cant get service from ANY Lexus dealer unless I pay the $250.00ish bill.