I had it similar a while back, first the berk sent a text saying “hello” then when I asked “who is this” the phone started ringing and I didn’t answer then got what clearly scripted text saying I wasted time bla bla bla or I’m coming to your house, had f-all credit on that sim anyway, so just changed sim, got another for a quid and moved on.
Threats to your punting number highlight why it’s 100% sensible to use a dedicated, throwaway number for that purpose. And you should never use the same number for social media accounts, online registrations or other services.
Realistically, though, this is probably just a chancer trying to scare people. Most of the time it’s little more than scaremongering designed to see who they can extort money from, the dickheads are probably ultra rarely successful.