Idle query

For a BT line you hear a message which says something like This person had chosen not to received calls from certain numbers.

I had two last week, automated voice and a shocking line but I just put the receiver down. It's a known nuisance number.

The calls don't get through to me any more as I've blocked them! I just wondered what the callers heard.

Thank you Grammaretto. It won’t worry my Mum. She’s no longer with us ?

Many of the calls are recorded messages, activated when someone answers the phone. I've stopped speaking now when I pick up the phone. A genuine caller will speak first... 'is anyone there?'....cold calls end abruptly. Most of my cold calls stopped when I started using an answering machine.

I was told you should hang up because you could be paying for the call.
Sorry to be a downer.
Before robots, I found myself talking to a woman in New Delhi about the weather and another in Wales who chatted about her family! I was given a telling by a young man working for Sky who answered me back when I told him not to do such an annoying job. He said he was a student and had to make some money to pay his way.

My mother used to say Just hold on while I get a pen. And then leave them hanging on until the penny dropped.

I have caller ID, and only answer numbers that I recognise.

If I understand it correctly it just continues to ring out at their end but you can't hear them.
It would be very satisfying if it could literally give them a message like 'You're blocked, you pest!' wouldn't it?
Apparently there's a tape on YouTube called Lenny which is really a robot. It sounds like an old man answering the phone - he chats for a while, then asks, 'who did you say you were, again?' until the pest gets fed up and hangs up. It tests their patience and wastes their time.

I am tempted to write what I hope could be said but it would be probably be deleted.
Along the lines of ' go away you very annoying person'.