The ICO said the company used automatic dialling to make millions of calls about payment protection or debt management.
The calls are made without peoples’ permission and the ICO said it’s impossible for people to opt out of them.
The enforcement people at the ICO removed documents and computer equipment for forensic action and to decide what action it could take to prevent the company from making the the prerecorded calls.
Options include issuing a civil monetary enforcement notice.
David Clancy, who led the raid for the ICO, said: “It is astounding to think this one small company has the ability to pester millions of people with unwanted calls on a huge skill.”
He said the rules are clear about making recorded calls without consent. “If the evidence proves the law has been broken, we will act,” he said.
Electronic marketing regulations are soon to change and that it will make it easier for the ICO to take action, he said.