Keep getting on to the planning enforcement team. They are the ones who will eventually sort it. however it can take years. Do you remember the farmer who built a home hidden behind straw bales in Surrey (England)? Took over ten years for the council to get the building demolished. Just keep the pressure on so they cant 'forget' about it.
http://www.bbc.co.uk/news/uk-england-surrey-36445848
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