robocalls

In the past 6 days, I have received 10 robocalls on my landline saying, "Your I Cloud account has been breached." Then it goes on to say I should stop using my computer and press 1 for Apple Support. When I press 1, usually no one is there. If I get a person, he or she hangs up when I tell them about all the robocalls. Is there any way to stop this spam? I have actually been getting these calls for months, but I only started keeping a record of them for the last 6 days. I continue using my computer, and there's nothing the matter with it.