Scammed while trying to buy the ED reset bug

Scammer's profile link: undernational
Amount scammed: 4B rs3
Discord ID + Unique Discord ID: Mm1959#7255 + 965682499441295401
Proof that it's their Discord: https://i.imgur.com/GyggOme.gif
Explanation of the trade: he asked for 4B for the Elite dungeon reset bug, i paid as you'll be able to see in the screenshots and then he asked for another 4b, never sent the method
How they scammed: after being paid he asked for more money to actually give the method.
Other relevant trade screenshots:
https://i.imgur.com/YpQjci1.png
https://i.imgur.com/50R5iDx.png
https://i.imgur.com/di75WV1.png
https://i.imgur.com/66okNke.png
https://i.imgur.com/rXsMmoW.png

 

its pretty clear he's not paying back
https://i.imgur.com/VOeH3jT.png

 

https://i.imgur.com/D2WaJFZ.png
yep he's saying he doesnt have the gold and keeps asking for another 4b... my brain hurts from dealing with him epega: