If you are actual banned, most servers do have a forum you can try a ban appeal.
Explain what happened to them.
The hacking message can come up in some rare circumstances, for example lag and a creeper blowing up while running or falling.
Or other combination like that. But to get enough speed, to actual get that message is rare (but rarely can happen).
I go to a server listing site,
Try to connect
And upon entering some of them say
I Solve practical problems
I go to a server listing site,
Try to connect
And upon entering some of them say
"You were banned by remkit for hacking"
I Solve practical problems
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Moderatorcontact the server and put your case across as theFriedZombie suggested