He was bragging about that he has lifetime sponsor and wanted to buy 100m, i already got scammed once so we talked some more then I decided to sell him 80m, as soon as i gave him he said I am sending now. 5 seconds later he blocks me on skype and logged on runescape. 2nd time selling gold and 2nd time getting scammed this is getting ridicilous.

Please follow the template and include screenshots of this. What you provided is not sufficient evidence at all.

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We need a screenshot of his Skype ID as well with the conversation visible in the background and where he confirms that Skype. You can view his Skype ID by clicking on his profile picture.

 

Edit: Nvm I IP banned him, he was also evading @Huho who was banned for scamming. He'll have to refund if he's willing to return. Sorry for your loss.