The various fake numbers are ‘spoof’ numbers, this link is for an app that can help with that though for mobile calls and iPhone use only, if someone has their mobile listed then they may be able to land him but cops need to support.
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www.trapcall.com]
If the call cannot be traced through the app, it is possible that the caller is using voip - which it has been said may not work on the app in that case.
For the landline it’s call the cops because they have the ability to trace back through the services.
This is an awfully long time for such a predator to continue on like this.