I dont see it is mentioned anywhere in the OP that u dont pay banned members. Moreover, from the post history, it is clear that he was banned after leaving your campaign. U have no right to deny payment of someone who got banned after leaving your campaign. Moreover, this member is in your campaign list. There is no proof that he changed sig when he was part of your campaign except for trusting your word. Rather, it is already proven that you are not trustworthy. It seems that u r simply taking advantage of someone's ban for not paying him.