I have received multiple calls from the idiots at IC Systems. The calls are for a relative who does not live here, and I have told the callers that - and to cease calling by number. The latest clown said unless I gave him the number of the relative he was going to keep calling me. I informed him that was illegal and I would report his threat. I have done so. I let him know of the (very) low opinion I held of his type.
I will simply lift the receiver and hang up on any further calls until I get a machine hooked up to record the conversation - at which time I will take one last call to gather evidence for my complaint.