Seriously don't even waste your time - this is just another example of a government department setting up a point quango to divest themselves of any cost or responsibility for dealing with crime.
I report a case of fraud over a month ago, heard nothing since, and even on the site it states that most cases won't be investigated.
So in essence, waste your time filling out a report - it gets filed and forgotten and meanwhile the police and the government can state that they have a department to deal with fraud (they should actually say "file fraud reports"
OMFG - Update - the recommendation from Talk Talk following them losing all of your personal detail to random hackers (seriously, how bad is their security) is that your report any fraud to Action Org - bad enough you have been ripped off due to an incompetent ISP but you are also recommended to waste your time inputting the detail into a pointless government quanqo who are about as effective as sticking flowers under your nose to fight the Black Death in the middle ages were.
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