Two sisters-in-law collected more than $1,000 using donation receipt booklets purportedly for the Willing Hearts charity for the underprivileged.
However their intentions were anything but charitable. The books were fake, with Santha Devi Lingam getting them printed in Malaysia to escape detection from the authorities in Singapore.
The 35-year-old spent two weeks in May going door to door, cheating donors of $855.
Her relative Kamisah Shaik Mohamed, 35, conned 17 victims out of $170.
They were caught when a resident telephoned Willing Hearts to check on the donation drive. The charity called the police, who arrested both women at a block of flats in Ang Mo Kio.
Santha was yesterday sentenced to six months in jail and Kamisah to two months.
District Judge Lee Poh Choo said the duo had "taken advantage of the public generosity and kindness and gone blatantly door to door to cheat".
The court heard that Santha came up with the idea of pretending to be a donation collector after seeing such volunteers at a shopping centre.
She then roped in Kamisah.
They decided that their "cover" should be the Willing Hearts charity.