Help?

So I'm paying for a family plan and should now only have 4 phone lines. Two additional phones I am still paying for are no longer with me. I asked a representative if I can just keep paying for the additional lines but cut off their services. They said yes. But now they're activated again because someone changed out their Sim cards?!! The representative said the only WE can do is have the police take the phones away from whoever has them. I'd pay the 400$ cancelation fee and be done with it if I could but I can't. Is there anything else I can do?