I responded to a phishing email which appeared to be from UNT system administrators. What should I do now?

UNT system administrators and staff will never ask for your UNT password. Immediately change your password and discard the old one. The senders of the fake email are collecting valid credentials to use for access to UNT services, especially email through which spam can be sent. Report the incident to your supervisor and system administrator, so any additional containment or handling can be coordinated.