When once you have fallen for an investment scam, sooner or later scammers always come back in new disguises for another bite of the apple and try to take advantage of you all over again. The most common way that they do it is to pretend to be a lawyer, a business or a government agency that claims it can get you your money back.
The very fact that they made unsolicited contact with you is suspicious. Who but the original scammers knew that you were hurt with Olsen Capital? And if there was a legal action to which you were a party, why did you not get official legal notice of any such class action? You would have done if there was litigation on behalf of you and others who were scammed.
Calls like yours are how scammers and hackers get significant personal identifying information and look to commit identity theft and to steal as much money as they can get you to send them to recover your so-called award.
AltCrypt is just a digital wallet. The firm is Swiss and the domain address has been registered since 29 September 2020. It is a legitimate site, but so what? The site is just the means by which you supposedly will get your money back from someone else. But you won't. Instead, the scammers will use that account under your name to engage in money laundering and you won't be able to trace them.
Tell them to just mail you a check. They won't of course. But if they are real, there is no reason that they couldn't.
You can report this to ActionFraud in the UK at https://www.actionfraud.police.uk and to the FBI in the US by filling out an online report at https://ic3.gov/