During this time, the woman was taken to a Wellington address and assaulted before being driven to a beach and dragged into the water by a chain.
She managed to escape but eventually had to swim back.
Following this, one of the man's co-defendants tried unsuccessfully to cut off one of her fingers.
The judge said Malua Bentley then severed a different finger.
After this, the woman was taken to a different address and kept for several days chained to a couch.
She remained crouching in the room with her fingers wrapped in rags while those involved used drugs until she was able to escape.
France said the man's actions were callous and caused mental as well as physical trauma.
During the sentencing, the judge said Malua Bentley's unusual childhood living arrangements had impacted his development.
He said Malua Bentley reported smoking marijuana and drinking alcohol from age 12, before starting methamphetamine use at 17.
The defendant's lawyer Garry Turkington said the man was reconnecting with his Samoan heritage and had an anxious desire to recover from his drug addiction, which he said came from his dislocated childhood.
Growing up, Malua Bentley split his time living between Samoa with his grandparents and San Francisco with his mother- before moving to New Zealand, where he was born, at age 19.
Turkington said the defendant had shown profound remorse for his actions in a letter to the judge.
He also confirmed the man was willing to be a witness for the further trials.