Q: Unsolicited Calls from a Tech company who says they are affiliated Apple?

I receive at least 1 recorded call every other day. Today they called 5 times! They are unsolicited calls from a Tech company who say they are Apple and that there is a problem with my ICloud? Has anyone else had this problem? They don't give the option of being unsubscribed since they are pretending to be the Apple company. What can I do about this?