I've said it before - you should get onto your M.P. about it. It's no good just moaning on here. Get the M.P to ask (tell) the Police to investigate it.
I have done this and it works.
Action Fraud has recently been found not fit for purpose by a select Committee or suchlike. The lack of action by the authorities is a national scandal and should be brought to the attention of your M.P. Drop him an email and ask for a reply, contact his local constituency office if he has one etc etc. Get on to your local police and crime commissioner, again demand a response and some action. You are paying business rates and tax and are therefore entitled to assistance. The Police are under a statutory duty to investigate matters.