u/IEATTOES123

So basically I'll try to explain from what I understand. Basically my friend little brother visit a certain sex chat website/app(I'm not sure which one) and they do a video call where they jerk off together and the guy that blackmailed my friend got a recording and screenshot of my friend little brother and threatened that he will release the video if they didn't pay. They did pay 350 but that's only like 2 things, a screenshot and a video and there's two more things left because the person demand my friend to pay 600. The only advice I give my friend is to block that number but I'm kinda afraid the person will post the everything he have left on social media or the person have another phone with the recording that he saved. So, any advice?