I think you get these whether you have been scammed or not. As soon as I know or it comes up as potentional scam call, I hang up, use the ''who rung me'' service on Google, and delete.
The funniest one I had is going back many years to when my 3rd son was 21. He is now 35 so...
This gentleman of shall we say ''foreign persuasion'' rang our house landline (My God we still used landlines a bit then - eek! How terrible quiant. Ha)
I answered and he asked for my son, by his first and second name. I said he wasn't in and could I help him.
He started going on about this debt my son had run up some years before and they had finally tracked him down and wanted payment. I knew it was a scam. I just let him talk.
When he had finished I said ''Really, that's interesting. Firstly I am his mom. 2ndly you have just broken the data protection act and 3rdly that is not feasiable because when you say this debt is owed my son was only 14 going into 15 at the time.
He said ''Bye'' and promptly hung up LOL It was so funny. It took me ages to tell them all what had happened as I was too busy laughing.
There has been other funnies since. That is the funniest of them all.