Three volunteers have asked Brent East MP Sarah Teather to support their campaign for an external investigation into concerns about management and training at a Citizens Advice Bureau.
The trio, who worked at South Kilburn CAB, claim the CAB and Citizens Advice, the national body, failed to take their grievances seriously.
They allege that the number of volunteers who completed the Certificate in Generalist Advice Work was inflated to please funders and that volunteers had inadequate training to give advice.
"We were just put on the job without any proper training," said Beverley Booth. She, Helen Jacovides and an unnamed third volunteer want the inquiry.
A national Citizens Advice spokesman admitted the number of people completing the advice work course had been miscalculated but denied it had been deliberately inflated.
He said the bureau recognised "the observation of trainees in the initial stages of training was not robust enough", but this had been addressed.
South Kilburn CAB had investigated three complaints, he said, and there were no plans to take matters further.