The worst ones were the calls that my late father answered after my mum died - all asking to speak to her. As ,at the time, he was struggling to come to terms with the loss of someone that he had been married to , he found it horrendously upsetting.
I answered one call and asked the caller if they were psychic and he said they were happy to call anyone anywhere(he was Indian, called Steve!!)
We bought a new landline phone with an inbuilt call blocker where anyone has to announce who they are before being put through and you can decide to accept the call or not. Hey presto! no more scam calls !