Here is how you can make this right.
Slowly start to undermine his reputation by spreading gossip and white lies until the populous believe he lied. Following this, he will have no choice but to publicly confess/apologize.
But you don't stop there. Next you get personal. Give eloquent Ted Talks about his embarrassing attempt to con his way into being a semi-pro runner. Then, hire the mafia to break his knee caps just because you can.
The final step because we still don't think he learned his lesson. The time will come when he can't even fall asleep without fearing that he'll be attacked or publicly ridiculed the very next moment for he is now paranoid beyond reason. Now, with the speed of a god damn cobra, you pop out of his closet (you've been in there for 3 days waiting) and yell "PRANKED BlTCH". At this very moment you've won. However, because he is so frail from developing an eating disorder after you made so many public attacks on his physical image over recent months, he has a massive heart attack and dies right in front of you.
You stand there in disbelief as reality sets in...he used his final UNO reversal card to "PRANK" you in the ultimate way. Now you are going to prison for murder and your only option to survive is to become 6ix9ine's piece of ass for protection.
Let this be a lesson for all of you...revenge cuts both ways.
Later thots,
AlphaMale