If your lawyer is not a specific Industrial Relations/Employment lawyer I would be seeking specialist assistance first. It is my advice that you have a strong case for constructive dismissal but your first steps would be to approach your employers
HR representative and follow the grievance and dispute process. Do not engage the manager in any further conversations, especially if not accompanied by a witness. You need to act quickly because unfair dismissal claims have a 14 day time limit for lodgement. Good luck......