Three weeks ago I marked an order as completed but since it was a long term project the seller promised me to keep on working even after the order completion (I paid him advance for the remaining work). Since before that I didn't get any complain so I believed the seller and marked order as completed upon his request. Now I feel some changes in his behavior, he is not responding and I can't see any progress for my task. Should I report him on Fiverr? Since I have paid him before the completion of the whole task I am not sure if Fiverr will entertain me. Also if Fiverr helps me with this, is there any chance that I get my payment back?