Thanks for your reply.
The model was that if the Charities signed up with MAD, and sold / auctioned MAD products, MAD would give a high percentage of the profit back to the charities.
I don't think the charities paid MAD as I think MAD offered them the 'party packs' (which I designed) free to encourage them to have jewellery parties (selling MAD jewellery).
I had no contract of any kind with 'MAD' - never signed anything. I have the original files for all the artwork and proof that MAD asked me to produce the work.
I'm more worried about MAD suing me as they won't want the charities to find out that they don't pay their suppliers. I've since found out that the man who runs it has gone bust 5 times and is very used to court procedures etc..
I hope that's enough info for you. Let me know if you need any more.