Here are the useful facts AFTER each party agreed the Saimonas was to complete the order:
Saimonas incorrectly (or without valid proof) believes that Retweets signed into the account and so Saimonas posts on the dispute that he is done with the order
Retweets logs in the account and bots, presumably because Saimonas has said he's done with the order, but the dispute hasn't been resolved and no decision has been made
Retweets completes the quests by himself presumably because he's running out of membership and can't wait for Saimonas to decide if he's going to do the quests or not
You both ave really thrown us through a loop. It really isn't this complicated or hard to figure out but you guys are absolutely terrible at communication.
Because Saimonas said he was done with the order and wasn't going to complete it, it is somewhat reasonable that Retweets logs in the account and completes the quests himself before his membership runs out. If you two could communicate better, this would have never happened. Regardless, Saimonas will have to refund Retweets 3.5M because he did say he was done with the order prior to Retweets logging in. If Saimonas had not said he was done with the order, this would be a different decision.