Body Door Handle Exterior problems of the 2018 Tesla Model S

I own a 2018 Tesla Model S. While it was still under warranty the passenger side door handle quit working and it was no longer possible to open that door. Tesla replaced the door handle at no change with a newly designed mechanism. It was explained to me that they redesigned the mechanism which had a high failure rate, and my car handles would no longer be installed in later cars. I asked if they would change all 4 door handles for me, and was told they would not. Now several years later, another door handle has failed. This time dangerously. The door pops open spontaneously, and therefore the car is not safe to drive. I have an appointment for repair, but at full cost. Should Tesla not cover the cost, as it makes the vehicle unsafe to drive, and they clearly knew about it when they originally sold me my car?.