I had one of these calls from a firm of ambulance chasers saying that not someone, but I, had been injured in a car accident in the last three years.
It just happened that DD who shares my surname and first Christian name did have a serious road accident 18 months ago. She is also gets very distressed about receiving these calls. Anyway I told the caller I hadn't been involved in even a minor accident for about 15 years. He sounded very confused and asked me whether I was sure! I said yes and rang off.
DH constantly gets calls from boiler rooms, those overseas outfits selling dud shares. We always know what they are because they use DH's full Christian name when he has always been known by a shortened version. If I get the call I usually hand it to DH saying very loudly 'I've got a boiler room on the phone for you'. It really annoys them.
We cannot just ignore all international calls or number withheld calls because DH still works now and again as a consultant engineer and most of the work is on mainland Europe, so there is always the possibility that it is a client.