They call on many variants of the last 4 digits of this number. They claim that I invested in crypto and got scammed and they have the money in a bank account that I can access with their help, all I have to do is give them my details, bank etc. I did get scammed in a major crypto advert from youtube years ago. But these are just scammers too. Don't give them any details. All the people who were scammed probably had their details sold or stolen online, so that's how they can get to us.