They must get tons of cease and desist emails claiming to be copyright holders. How do they know their affiliate doesn't have a receipt for that set and your dispute is actually with a content provider? How would a sponsor know for a fact you and only you hold all rights?
Mail ARS photocopies of the evidence you are ready willing and able to present in civil court to prove your rights have been violated. Get the contact info for their affiliate so you can find out whether he is a lone wolf or whether a larger problem exists because he bought your pics somewhere.
If after having been provided with proof ARS won't help you, burn 'em in court and set an example everybody else will fear and avoid.
Works for me. When I've mailed eBay proof of bootleg copies of my tapes being on their site they take action right away.
<A HREF=http://www.karate.as>
Black Belt Self Defense System</A> -Easy Upsell For Your Non-Adult Sites