As others have noted, these threads don't tend to serve much purpose because there is no one on this forum who can help in a situation like this, and everything should be handled between the account holder and Blizzard. There are no tips or tricks that we can provide for not getting banned, as this is a forum centered around multiboxing online games where the playstyle itself is already, in some form, allowed, and so when people say they were banned for only multiboxing, it just simply isn't true.

Could you have been doing something wrong and lying about it? Yes.
Could you have been playing normally and been caught up in a false flag? Yes.

Regardless, no one here is going to be able to tell anyone else why something happened to their account, because the only two entities with the entire story are the account holder and Blizzard, and allowing these threads to stay open results in nothing other than speculation and accusations—most of which tend to be quite unhelpful.

I am locking this thread, and we will be locking/removing all future threads about being banned that tend to show up from time to time. Finally, when we make the move to the new forum, there will be a specific rule against creating threads such as these, so that everyone is on the same page.