[Cil]

One of the most prominent places to try and get help for grief would be to go to the discord server and to type a message in the get-help channel, if you cannot do that message a staff ingame, you can ask in chat or do /list admin /list mod or /list guardian to see if any staff are on, and fo clarification this does sound like you've been griefed. Lava is a tricky thing to get removed, but Im sure a staff would happily take care of it for you!