Dunder Heads
What! are you people serious , implement new policy's , contact IBEC , change the security system , no wonder you need to have management training to guide you lot.
Simple is best.
If you want him out of there , get someone to contact him, for a job of work. Let him make some calls and quote and give give feedback to the fake client. Its all , misuse of company facilities. Follow it through , then confront them.
Once you have a copy letter from him to the supposed client , his balls will be , how do you say , dropping like lead.
Or if you just want to tame them