Is headoffice-un.org a legit website?
Did you receive an email from someone with an address @headoffice-un.org? Did you find some information or an offer on a website starting by http(s)://headoffice-un.org?
What does that mean?
This address is probably used by scammers.
Report your situation immediatly to the real organization.
What should you do?
Do not trust it, and report it to the official organisation.