Print out the posts and see a solicitor that practices in defamation and have them send a letter threatening them with action unless it is withdrawn and an apology posted comparing the lies.
This is how you have to deal with this and people that have read it have to give evidence on what the posts made them feel about you.
You have to give evidence on how they started to treat you different and anything negative that has happened because of the posts.
The law society of QLD can refer you.
Here is an example of what can happen to this person.
I hope this makes sense and is of assistance If there is nothing further
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