litigation's warming up, page-3

Hi all,
just like "jaykaway", yesterday I received letter from Bookarelli Pty Ltd offering to represent me in the litigation for the fee of 50% from any payout??? I lost 60K with BNB and invested this money (bought shares) apparently when BNB was already trading as insolvent...I'm a bit lost here and as this is not my territory I appreciate some opinions on this from someone more experienced ...
Do we have to sing up 50% of payout to some legal company to represent us individually or do we automatically get some payout as per shares we where holding?
Do we have to submit some claim with proof of shareholding and if yes to whom?
I appreciate some comments or navigation what needs to be done from my side...Thanks guys...