CHICAGO (CBS) — A fraternity at the University of Chicago isn’t getting its mail until it apologizes to a postal employee for a crude prank.

READ MORE: Belmont Cragin Carjacking Leads To Fiery Crash, Multiple Other Parked Cars Struck

Postal carrier Iran Becton said about a week after Memorial Day he had an order to deliver dozens of postal supply boxes to the Phi Delta Theta fraternity at 56th Street and University on campus.

The Sun-Times Mary Mitchell reports, it took Becton six or seven trips to deliver the packages until one of the fraternity members told Becton to read the name on the order “Reggin Toggaf” backwards.

Reversing the names, the first name is a racial slur. The last name is a slur for gay men.

READ MORE: Surveilence Video Shows Moments Leading To The Arrest Of Allan M. Brown, Suspect In Kenosha Police Shooting

A representative with the letter carriers’ union meet with the fraternity’s former president.

He was told that it was a practical joke by another fraternity.

Becton was upset by the incident, saying he felt humiliated.

MORE NEWS: Police Investigating Bank Robbery In Hyde Park

A statement from the university calls the incident “deplorable” and says the school is cooperating with the Postal Service investigation.