OP, with amount of thread you've created so far it's likely you lack of common sense and security awareness. Rather than looking for free/easy way to earn Bitcoin, you should consider learn about digital, economy and cybersecurity literacy.
The person who called me claims that they can send me money that I had invested in an online trading platform that was found to be fraudulent and was subsequently shutdown. This person claims that my funds will be sent without me making a payment to them until after I have received my funds.
Those scammer probably will just ask for personal information (such as driver license and passport) or ask you to send specific amount of money first.