The 16-year-old male teenager and 22-year-old woman had allegedly relinquished their bank accounts to the scam syndicate for monetary gains while the 31-year-old man had assisted unknown individuals to subscribe to phone lines.
Some of these lines were found to be linked to the scam cases.
The woman, Rajadi Rajasinghe Manamendra Patabadilage Vishwa Madavi, a Sri Lanka, was charged on Sept 17 for relinquishing her bank account under the Computer Misuse Act.
For a first conviction, the offence of facilitating carries an imprisonment term of up to two years, a fine or both.
Police investigations are ongoing into the involvement of the man and male teenager.
On Sept 14, the Ministry of Defence made by individuals impersonating SAF personnel.
In a Facebook post, it said it was aware of seven such cases, none of which involved actual SAF personnel, and that police reports had been lodged.