egine damaged due to oil but my car was serving November the 20

On the 20 November 2020 my car was out from service at imperial land rover George and during the process the oil sensor was broken by the dealer. And I was told that it was fixed but on the07March 2021 I had problem with my car when I check it had no oil and it did not show at all that oil levels are low when I check the dipstick it show no oil but without the alert from the dashboard and now my car engine is damaged due to that iys less done 3 months with few km drove with the car no oil and my car engine is now damaged and I m expected to pay nore 100k in order my car to be fixed can some one please help? car model is a range rover evoque