PUT IT UP FOR ADOPTION OR SOMETHING

Roblox has taken over my sons life, I need someone here to help me, it started off pretty small, he told me he was into this game called Roblox. I looked it over, seemed nice. That was 5 years ago, now my son has locked himself inside his room, using a pile of roblox toy plastic to guard me from opening it. When he comes out (The 1 time he does a week) he carries 5 bottles of empty soda pop filled with human waste and empty bags of food and throws them away. He will not speak to me, and will not leave the house, only will play Roblox. I've tried it all, but he seems to find a way to play roblox. I tired killing the WiFi but he payed someone in robux to let him have his, so he has his own wifi source, and trying to take away his PC causes him to go into a fit of terror, where he'll scream "ROBLOX ESCAPE THE BOSSBABY RAINBOW OBBY FIGDET SPINNER" until he gets it back please someone tell me how I stop this. I've tried doing a thing I call "Good Robloxian Robux" where I give him Robux when he does good things, like come out of his room, or doesn't use more then 20+ hours of wifi a day but it only works so much please someone tell me how I can get my son back, I miss that boy, he's 25 now, and needs a job