A Sri Lankan woman who was brought to the UK by her employers has told ITV News of her ordeal at the hands of the family who forced her to work without pay.
Mother-of-two Anula's wage of around £100 a month was stopped when she arrived in London, where she was forced to work all day and suffer routine abuse.
The 44-year-old was forced to clean three houses and look after five children who were allowed by their parents - her 'employers' - to taunt her and call her names.
"They called me animal names like doggy, cow - they have no respect," she said.
The woman was made to sleep on the floor, forbidden from leaving the house alone and even shouted at for using the family's milk.
She said she was too frightened to ask for any money that she desperately needed to support her family at home.
The woman eventually managed to escape from the family and took shelter in Victoria Station.
Her own passport had been confiscated by the family and the visa allowing her to enter the UK was stamped in a family member's passport - leaving her effectively tied to the very people who subjected her to the abuse.
The Government's Modern Slavery Bill aims to help people in situations similar to Anula's, but critics have told ITV News gaps in the bill could leave workers at further risk of abuse and exploitation.
Campaigners warn that the 'tied visas' part of the Government's Modern Slavery Bill has "strengthened the hand of the slave master against the slave" as they cannot get another job.
"What tying them to their employer has done has worsened their treatment under their employer, and I think the Modern Slavery Bill needs to address that if they don't want to undermine the very meaning of the bill," Kate Roberts, from the migrant support charity Kalayaan, told ITV News.