My caller ID shows up wrong when I call my voicemail

Something strange happened a few days ago and I don't know how to correct it. I was calling my voicemail to pick up messages, and accidentally swiped "something" but I don't know what. The header (caller ID at the top) changed from "VOICE MAIL" to the name of one of the people in my contacts list. Now, every time I call Voicemail, it looks like I'm calling my friend. Can anyone help me change this? I tried deleting her from my contacts list. I tried setting up the name "voicemail" in my contacts list. Every time I put her contact information back in, she shows up in Caller ID.