the main reason is with which system u got banned
FF or a manual ban ?
if FF than just wait for unban wave in manual ban thaj u have almost 50/50 chances to receive account
my friend got banned for reason as admins says scam but he never scam anyone ... so the question is what they got on him because they are not answering like they have something in this case to add just force delay it (for since 3-4 years) - so you are lucky its only 21 days ...