Same thing happened to my mom once, except with text messages. She texted the wrong number thinking she was texting me. When the other person responded that it was a wrong number, she kept texting them thinking I was just trying to goof with her. After about five texts, she called me to tell me it wasn’t funny anymore and it took a few minutes to convince her I really had no idea what she was talking about.
kinda obvious why her son doesn’t respond to her voicemail messages…On another track though–when my husband and I were first dating, he called me asking for my by my last name (ms. so-n-so), not remembering that I lived with my parents. When my mother answered the phone and thought he was asking for her, they carried on a conversation for about fifteen minutes, before he finally realized it wasn’t me. SOOOO glad, he didn’t say anything freaky!!