Here’s one for you:

1. Go to eircom.ie.
2. Click on phonebook.
3. Type eircom into the search.
4. Ring the very first result, which is: Eircom (1800)475475.
5. You will, unexpectedly, get through to the Eircom malicious calls department.

That’s right, the phone number for Eircom on Eircom’s own phone book web site appears to be wrong. Beautiful.