Why anyone would do business with a company (featured on the news constantly for violating some law or the other) who obviously uses underage and vulnerable young girls and begs off prosecution by having everyone sign a waiver claiming they are 18 to turn a profit, is a mystery to me.
This is not the most scrupulous of businesses practices, so do not expect fair and ethical business practices from them. ALL you can do is cancel the credit card in question, submit disputed charges within the timeframe required by your credit card company, and remember next time, BUYER BEWARE.