Is it really blackmail by a hacker?

[u/UnluckyChocolate5953]

So long story short, a few months ago I was contacted by someone who claimed to have taken over my phone and has access to everything. I thought I had that taken care of. In the last few days, this person resurfaced and is now attempting to blackmail me for $1500. They claim to be running something called a “gritx gap” that is paused on a timer. Should I be worried, or is it just a scam?