Caller: a man and a woman asking for julie

my mothers old number called my new phone even though my mums old phone connected to this number has been disconnected since 2014 when it was smashed in a car accident in February and literally destroyed. she now has an iphone 11 pro with a new number, something even weirder is the fact that the sim card was retrieved from the phone and hasnt been put in a phone since august 2014 on my birthday to retrieve photos for a collage.