I want to find a horror movie I have seen abroad before, but I can't remember the name.

Brief introduction of film

Mary, a divorced woman, kept receiving mysterious phone calls from strange numbers, and then she found a mysterious atmosphere around her residence. Some time later, Mary discovered that the protagonist of the mysterious phone call came from the past, and she had to kill the caller to survive. But how does Mary kill a person who exists in the past? What will happen to Mary if the operation fails?