Your post is unclear. Were you banned in the GAME or in the forums? On the NA or EU servers?
4.06. Intentionally exploiting the physics system to damage an allied tank. This includes, but is not limited to, pushing an allied tank into line of fire, pushing allied tanks off of cliffs, bridges, into water, etc.
The key word in this rule is allied. You (and others) were banned for either team damage, team kill, and or pushing/blocking allied tanks. What happened?