Trouble With Models Claiming Rights

[TiffanyC]

I was wondering if anyone's ever had issues shooting a model and them coming back later saying that the conent is theirs. I have documentation (model release and photo id) that this person was my model and has no rights but they are going through ccbill and this is getting frustrating. Can anyone direct me where I need to go to learn more about how to make sure my ass is covered and to make sure that this doesn't get out of hand. This model is using the content on 3 other sites.

Thanks for helping!!!