Second estimate yes or no

Hello together, by my friend the son man has unnoticed minimally striped another vehicle. After he arrived at home, the police was already there, which was called by passers-by who observed the accident. Meanwhile, the victim in a free workshop had a cost estimate for the so-called “damage” made in the amount of say and write 550.- Euro on the bumper of a 2001er Seat Ibiza. On the vehicle of my friend however is not We don’t believe the free workshop’s estimate in any way. Is there a legal possibility that I might ask for a second estimate from a workshop I know or have set up in order to have a comparison??? Or do I have to accept this estimate??? I would be happy about every information. Greetings Colibri