Mitch Winehouse, Amy's father, has been vocal in his critisism saying the film is "misleading".
Speaking to BBC's Newsbeat, he says the film is unbalanced, biased and he certainly isn't happy with his portrayal.
Made by the same team behind the Bafta-winning documentary Senna, about the Formula 1 racing driver Ayrton Senna, the documentary, Amy,will be shown at this year's Cannes Film Festival.
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Mitch, The Amy Winehouse Foundation head, says the film presents him as unhelpful and not availabel to Amy an accusation he strongly denies.
"I was there every day. And if I wasn't there - because I was working or I was away somewhere or she was away somewhere - she'd phone seven times a day."
"And there's no sense of that in the film and that's what's disappointing."
He thinks the film should have been a bit more balanced: "A biographer puts everything down there and let's people decide for themselves.
"These guys have decided what to put in and what not to put in. It's a two-hour film and you can't put everything, but there's a got to be an element of balance and there isn't any."
"There are thousands of hours of footage of me and Amy larking about and having fun on stage, and off, but the only clip they found and used was of Amy and I having an arguement."
"They could really have made a fantastic documentary. The truth is 10 times better than this rubbish they are churning out."
"They have rewritten history".
"None of her friends she had from the last three years of her life are represented."
Mitch's interview comes as a spokesperson for the family said they "would like to disassociate themselves from the forthcoming film about their much missed and beloved Amy".
He went on: "They feel that the film is a missed opportunity to celebrate her life and talent and that it is both misleading and contains some basic untruths.
"There are specific allegations made against family and management that are unfounded and unbalanced."
The filmmakers defended the work saying: "When we were approached to make the film, we came on board with the full backing of the Winehouse family and we approached the project with total objectivity, as with Senna.
"During the production process, we conducted in the region of 100 interviews with people that knew Amy Winehouse; friends, family, former-partners and members of the music industry that worked with her.
"The story that the film tells is a reflection of our findings from these interviews."
