Been getting calls every day, no VMs

Just got a call from this #. They left no VM.

Call just came in.  No vm.

Asked if this is Sheila and I said yes and phone hung up

Never answer yes to questions such as this, you do not have any idea where in the world these people may be or what they do with a recorded yes answer! Always answer those questions with a question of your such as Who's calling?  Do not let them try to lead you on to a yes answer no matter what.