I had three receivers, two of them were hooked up. The person I spoke to first was an idiot and an #@!hole. He would not wait for me go in the garage and get the third one... which I had not hooked up since our move. To top that off, I had deactivated one of the two 311s I had, and I did not know which one was active and which one was not. They would not tell me the serial number on the box and let me hook up the right one. I hung up on the guy and called back.
This time around I got a lady... she was more friendly and explained why they were asking me to do this. I was more receptive to their needs once I knew why they were troubling me. The whole ordeal wasted over an hour of time as we had to hook all four, I had to drag in an old 19" TV, to hook up the deactivated one as the techs are not authorized to give us any info till the test is complete, about the receivers.
Once the 'test' was completed, she identified the deactivated receiver for me!
It is painful, but the alternative is to have phone lines hooked up to receivers... I don't like that.