Owner Parking in Visitors Space with consent of Managing Agent

We live in a small villa block and one of the owners parks constantly in visitors parking area. We’re not there all the time but our visitors have to park in the street when we are there. Called on the owner of the car and he was most abusive and claimed our car had scratched his.(It hasn’t and he has no evidence). And that all the owners had agreed informally that he could park there as often and for as long as he liked.

The Managing agent has emailed and said that  all should live in harmony(we agree).But then went on to say that the parking issue is being used by us as an excuse to harass people as street parking is good and plentiful, the area  is safe and she left her car in the street, where she lives, very often.

Also said that as we aren’t in residence all the time, then  even though we are owners we are using this as a personal issue. She advised the owner who parks illegally to take out an AVO against us and that he should call the police before opening the door. Also the correspondence will not be put in the file as selling to another buyer will be very hard with this dispute in the public area.

All the above are almost exact quotes from her email.

We of course deny her statements but what can we do? This is a most unpleasant situation. Is there any way we can have mediation between us and the Agents in Fair Trading as none of the other owners want to get involved ?