You need to put the DVLA and your local police on notice of the problem. Once this occurs every case will be examined with an examination of the photographic evidence.
You should also endeavour to make a minor but visible change to your car which will show on camera as has been suggested elsewhere.
If any non-genuine fines come through inform them that you believe your car has been cloned and that you have previously reported it as such with as much detail as you can to support the case that it could not have been your vehicle.
DVLA will consider issuing you with a new VRM if the problem is persistent and cannot be otherwise resolved.
Our honest used car pricing is a little bit different to all the others. You can get to our values through make or model - you don’t have to follow a prescribed route. Plus, it’s live, which means we can react to changes in the market quicker than any printed price guide.