You would be entitled to return of some rent if you could prove the landlord entered your property (needs to be better than just your word) and even then you would probably get resistance to such a claim, which would not be worth going to court for such a small amount.
Might be worth a claim to Consumer Advice Victoria (CAV) for a rent refund which will cost you $65. But the landlord’s action certainly undermaines any claim they may make against the rental bond.
Have a look at the CAV Website for more information.