You need to get proper support as to locate the source of the intrusion to begin with as if this is your 2nd time somethings off. It’s highly unlikely to have been via Rock and more than likely a pc or Nas on your network from a dodgy link or email and it’s residing on them. If you don’t clear it it likely to reoccur. Paying up isn’t going to stop it if the the actual software it’s implanted is still active on your network.
Does Roon no longer play your files? Or is it just lock it out access from a pc?