Have you ma block the number! That's what I did to ensure I don't get disturbed at work again. I also reported it after I called back to figure out what it was. I did not press 1 to get a text message with details and waited awhile in hopes of talking to a human being and it just hung up. People who create this kind of phone calls are twisted and sick.
I'm sick of getting disturbed at work by this number every Thursday. I called back today to see who it was. As expected it was some scam number. I blocked the number on my phone to ensure this doesn't happen again, because it disrupts me and my coworkers when my phone rings unexpectedly! These people who created this scam are sick and twisted and must be stopped.