To whom do I complain?

I had a very minor collisions in a supermarket car park. The owner of what might politely be referred to as a rusty car reversed across my rear bumper. The damage to my car was superficial and covered by an after market insurance policy. There was no apparent damage to the other car, no details were exchanged. No injuries were sustained, my experience within the Ambulance service tells me that the speed of the collision, less than 5mph, tells me that no injuries could have been sustained.

As required I informed my insurers for information only. I received notification form a third party company that they had opened and closed a file.

Since then I have been contacted twice, via my mobile phone. The first contact said they could be certain of obtaining £3100, the second asks me to register my details with a website, and allow them to act on my behalf.

To do so would be fraud, the insurance industry is apparently concerned at the scale of such apparently fraudulent claims, yet my details can only have been provided to these third parties by me insurers.

I would like to know whether there is an organisation to whom I might complain.

Regards

Iain McFalls