It's been known for a while now that 'spamming' people that don't have you in their address book or 'spamming' to people you don't have on your own address book can result in getting banned; so I believe that's probably what has happened to you.

On the other hand, it seems that group creation/management is not working.
This will be my next bugfix, as soon as I can fix it. Alongside that, I'll update serial numbers so they match latest official WA client.

And for now that is gonna be all. Maybe a little improvement in the UI, but don't expect much nor expect it soon, sorry.

Best regards