Police said they raided the centre on Thursday and rescued 383 Filipinos, 202 Chinese and 73 other foreign nationals.
The centre, which is about 100km north of Manila, was masquerading as an online gambling firm, they said.
South East Asia has become a hub for scam centres where the scammers themselves are often entrapped and forced into criminal activity.
Young and tech-savvy victims are often lured into running these illegal operations, which range from money laundering and crypto fraud to so-called love scams. The latter are also known as “pig butchering” scams, named after the farming practice of fattening pigs before slaughtering them.
These typically start with the scammer adopting a fake identity to gain their victim’s affection and trust – and then using the illusion of a romantic or intimate relationship to manipulate or steal from the victim. This often happens by persuading them to invest in fake schemes or businesses.
Thursday’s raid near Manila was sparked by a tip-off from a Vietnamese man who managed to flee the scam centre last month, police said.
The man, who in his 30s, arrived in the Philippines in January this year, after being offered what he was told would be a chef’s job, said Winston Casio, spokesman for the presidential commission against organised crime.
But the man soon realised that he, like hundreds of others, had fallen prey to human traffickers running love and cryptocurrency scams.
Those trapped in the Bamban centre were forced to send “sweet nothings” to their victims, many of whom were Chinese, Mr Casio said – they would check in on their recipients with questions about their day and if and what they had eaten for their last meal. They would also send photos of themselves to cultivate the relationship.
Mr Casio said those running the scam centres trapped “good looking men and women to lure [victims]”.
On 28 February, the Vietnamese man escaped the facility by climbing up a wall, crossing a river, and seeking refuge at a farm. The farm owner then reported it to the police.
There were signs of torture on the man, including scars and marks from electrocution, said Mr Casio, whose team visited the man early this month.
Mr Casio added that several others have tried to escape but were always caught.
Police also seized three shotguns, a 9mm pistol, two .38 calibre revolvers, and 42 rounds of live ammunition from the centre.
Authorities are still in the initial stages of the investigation as most of those rescued from Thursday’s raid are still “shaken”, he said.
In May last year, Philippine authorities rescued more than 1,000 people who were held captive and forced to run online scams inside a freeport zone in Clark, a city also north of Manila – in what remains its biggest bust to date.
A UN report last August estimated thathundreds of thousands of peoplefrom around the world have been trafficked to Southeast Asia to run online scams.
The BBC has previously spoken to people who have fallen victim to these criminal networks.
Many have said they travelled to South East Asian countries such as Cambodia and Myanmar in response to job ads and promises of perks. They are trapped once they arrive, and threatened if they refuse to participate in the scams. Escapees and survivors have alleged torture and inhuman treatment.
Governments across Asia, from Indonesia to Taiwan, have expressed alarm at the rise in these scam centres. Foreign embassies in countries like Cambodia and Thailand, for example, have issued warnings to their citizens to beware of being lured into scam centres.
China issued public rewards forwarlords who were running scam centres across the border in Myanmar– these centres were run by Chinese mafia families and targeted Chinese nationals. Many of those arrested have been handed over to China in recent months.