Q: FaceTime calling incorrect number

My Friend is stating that on two occasions she has face timed my phone and someone else answered.  Then they hang up.  She is thinking that someone is picking up my phone and playing a game with her. However I am positive that noone has my phone in their possession at the time that she has called.  This is causing serious mistrust amongst us. Is it possible that someone has cloned my phone or APPLEID and is intercepting her FaceTime calls to me??

Thank you.

Michael