this is your problem mate,, not trying to be funny , just trying to help
THIS IS NOT A 500 never has been and never will be ,,just advertise it as what it is ,, a very nice well speced 3 door and it will sell
You are telling people its a 500 and thats what they think it is , but its not and people think you are trying to con them .
Be honest and it will sell

Paul