BP on Monday renewed its request for a federal judge to temporarily suspend settlement payments to Gulf Coast residents and businesses affected by the 2010 Deepwater Horizon oil spill, citing a scathing report on alleged misconduct within the court-supervised program.

In a court filing, BP attorneys said the report, issued earlier this month by the former FBI director Louis Freeh, shows the settlement program is plagued by problems that need to be fixed. US district judge Carl Barbier has already rejected two requests by BP to suspend settlement payments, but both rulings preceded Freeh's report, which was released on 6 September.

Freeh concluded that top members of claims administrator Patrick Juneau's staff had engaged in conduct that was improper, unethical and possibly criminal, but said he didn't see a need to shut down settlement payments.

BP's lawyers questioned whether Barbier would have authorized Juneau to begin processing and paying claims more than a year ago if he had known the settlement program would be "riven by conflicts of interest", would lack adequate anti-fraud controls and would operate in a "grossly inefficient and over-costly manner".

"While BP does not presume to know for certain, it submits that the answer most likely would have been an emphatic 'no'. Instead, the Settlement Program would have been instructed to fix its problems first, before being allowed to open its doors to the claims of class members," company lawyers wrote.

On 28 August, Barbier rejected BP's second request to suspend all payments to businesses and residents who claim the company's 2010 oil spill in the Gulf of Mexico cost them money. The judge said an internal probe by Juneau's office had not found credible evidence of fraud involving employees of the settlement program's Mobile, Alabama claims center. Barbier also ruled that BP's separate complaints about alleged conflicts of interest inside the settlement program did not warrant a halt in the claims process.

Freeh's report said two private attorneys – Glen Lerner and Jon Andry – used Lionel Sutton, a lawyer on Juneau's staff, to expedite a claim by their firm for nearly $8m. In return, Sutton received more than $40,000 in fees from payments on claims he had referred to their law firm before joining Juneau's staff, according to the report. Sutton resigned from Juneau's staff in June.

BP Deepwater Horizon. Photograph: Getty Images

BP also noted that Freeh's report said BrownGreer, a vendor for the settlement program, has resisted efforts to control its costs. BrownGreer has averaged more than $15m per month in fees for its work on the program. "BrownGreer appears to be part of the problem, not part of the solution," BP lawyers wrote.

Freeh's report said his work is "ongoing" and will result in recommendations for strengthening the settlement program's operations and anti-fraud measures. BP urged Barbier to suspend all settlement payments until Juneau and Freeh can reform the program, "bringing a satisfactory resolution" to the problems Freeh uncovered.

Juneau has said Freeh's report validates his team's work, calling his staff's alleged misconduct an "isolated situation".

"We welcome the recommendations from the Freeh report and we look forward to working with him to help improve all aspects of the claims process," he said, in a written statement earlier this month.