A 16-year-old boy from Tygerberg, Cape Town, was raped on a school rugby tour, but authorities did nothing, Beeld newspaper reported on Thursday.
The attack, which took place on 17 March, was filmed on cellphones and widely distributed.
The victim's mother told Beeld the school's first rugby team had camped near Velddrift on the West Coast, and played a rugby match against a local school.
The boy was allegedly raped with a broom handle and a banana later that night, after the match.
"On Friday night at around 11.30pm, my son sent me a 'please call me'," the mother said.
"He was hysterical and told me that the older boys wanted to shave his head... I insisted on speaking to them, but they told me I couldn't tell them what to do, and ended the call."
The boy then reportedly asked his rugby coach, Brandon Grant, for help, but he was told that he had to "stand up for yourself and be a man".
The next night, after the victim had gone to sleep, he was allegedly attacked in his bed and raped. The attackers also shaved his eyebrows, squirted toothpaste up his nose and drew a phallic object on his forehead.
The victim's parents removed their son from the school and laid a charge at the Bothasig police station on 20 March.
Police told them on Wednesday that the perpetrators would not be prosecuted, as the boy had not been examined by a district surgeon at the time of the assault.
According to the boy's mother, she was originally told by police that a medical examination was unnecessary, as the photographic evidence would be enough.
The school's headmaster told Beeld the school had held an "internal disciplinary hearing", and that several boys had been put on temporary suspension.