Explain how you would handle the following situation:
Player x calls for help in the OOC chat because his bank is being raided
I would tp to player 'x' to see if they are available to be tp'd to a roof. If they are not i would wait until they are. Then i would ask them why they did that. If they are then being aggressive or trolling i would then copy what they said and put it into chat (Them typing into OOC chat because his bank is being raided) and ask why they did that. If they say they are sorry and dont know what METAGAMING is and they haven't got a warning for METAGAMING before i would verbally warn them and tell them to read the rules. If they have previously got a warning for METAGAMING i would punish them as necessary.
You can just PM them, asking them to stop, or else.