I've seen a couple of people saying that if you don't get a response from Bungie about an appeal, then the ban will be upheld because they found reasonable evidence to keep that ban in place. There is even the following excerpt from an article they have about Account Restrictions and Bans: "Bungie takes actions to preserve the experience of all Destiny players, and does not take account restrictions lightly. If actions were taken against your account, then it was with evidence that a reasonable person could conclude that cheating was knowingly taking place." There is also this excerpt that indicates that your case has been checked by some of their employees: "Permanent account bans and temporary restrictions are only implemented with rigorous checking by trained Bungie employees. The appeals process is designed to help us further refine our tools for detecting and punishing players who violate our Terms of Service and the Code of Conduct."