The victim had refused to abide by his instruction that she should not talk to anyone on the phone.
The incident took place last evening when accused Noor Mohammad allegedly lured the girl to a room in Sangam Vihar area where he proposed her.
The accused Noor Mohammad, beat the girl with his belt, also made a vidoe record of the assault.
During the assault, the girl's clothes got torn.
"Noor Mohammad proposed to her, but she rejected the proposal. Thereafter, he told her that he does not like it when she talks to anyone on the telephone. On this, the girl told him that she has the freedom to speak to anyone. This angered him and he suddenly started thrashing her with his belt," said a senior police official.
The accused had threatened the girl if she told about the incident to anyone she will face severe consequences.
However, the girl told her parents about the incident yesterday.
Later, family approached the police and registered a complaint against Noor Mohammad.
Police officials have arrested the accused and further investigation is on.