"The woman was waiting outside her home on Monday evening for the milkman when she was approached by her attacker," Swati Maliwal, head of the Delhi Commission for Women, told the BBC.
"He told her that her regular milk delivery man wasn't coming and offered to take her to the place where she could get milk."
The woman went along with the man, who took her to a nearby farm where he raped her, Maliwal said.
"She kept crying and begging him to leave her. She told him that she was like his grandmother. But he ignored her pleas and assaulted her mercilessly when she tried to resist and protect herself," Maliwal said.
Local villagers who were passing by heard her cries and rescued her. They handed over the attacker to the police.
Maliwal, who visited the survivor at her home on Tuesday, described her meeting as 'heart-breaking'.
"Her hands are totally wrinkled. You get a shock when you hear what she went through. There are bruises on her face and all over her body and she told me that she had vaginal bleeding. She is suffering from extreme trauma."
Maliwal has demanded the death penalty for the attacker, whom she described as 'not human'.
"I am writing to the chief justice of Delhi High Court and the lieutenant-governor of the city to fast-track the case and hang him in six months," she said.
Rapes and sexual violence have been in the spotlight in India since December 2012 when a 23-year-old physiotherapy student was gang-raped on a moving bus in Delhi. She died a few days later from injuries sustained during the assault. Four of the accused were hanged in March.
According to BBC, "After the global outcry over the brutality of the December 2012 Delhi bus rape, India introduced tough new rape laws, including the death penalty in especially horrific cases, and promised to set up fast-track courts to try rape cases." But, campaigners say, things have not changed much on the ground, as per the report.
According to National Crime Records Bureau figures cited by the BBC, police recorded 33,977 cases of rape in India in 2018 — that works out to a rape every 15 minutes. However, campaigners say the actual numbers could be much higher as many cases are not even reported.