Mazrul Hakim Mat Zin, 16, said the incident occurred about 11pm while he was leaving the surau at the college hostel.
A senior student approached him and asked him to return to his dormitory.
He claimed four students, including two seniors, took turns to beat him up in the dorm.
The incident was witnessed by a few other students, he said, but added that they were afraid to help him.
Mazrul Hakim said he contacted his sister at Universiti Tenaga Nasional Berhad (Uniten) in Muadzam Shah to inform her about the incident and they then went to lodge a police report at 2.40am.
Mazrul Hakim, who claimed to have suffered injuries to the hands, feet and head in the attack, said he was then brought to the Muadzam Shah Hospital, where he was admitted for observation.
His eldest sister, Mazita, 34, said on the night of the incident, her youngest sister at Uniten, Nur Mas Idayu, contacted her to inform that she (Nur Mas) received weird text messages from Mazrul Hakim.
“Following that, I tried to call him (Mazrul Hakim) and the school warden from 11.40pm, but they did not answer the calls.”
Mazita said her family was disappointed with the hostel warden and the school principal for not informing them about the incident immediately.
“The warden responded to our message only after 2am when my brother was already at the police station.”
She claimed she was also informed by the school that another student had returned the handphone allegedly stolen by her brother.
Mazita also said this was not the first time that her brother complained of being harassed in school.
He is now traumatised by the incident, she added.
Meanwhile, Rompin Police Chief DSP Aidil Roneh Abdullah, when contacted, confirmed the incident and police had called six students to record their statement.