If a caller does not show their name, not leaving a voice mail, that pretty much tells you all you need to know. Calling back unknown numbers is the caller manipulating YOU. By getting you curious enough to do something that is against your best interests, the caller has "qualified you" as a mark, as a sucker. By calling back you show you can be manipulated, and that is a win for a telescammer.
You have a right to your peace and privacy. Ignore and block these calls. Do not call unknown numbers or suspicious names/no names in the caller ID. Ignore and block works, and over time, you will get fewer calls.