charging a 14 year old girl without consent and giving access to porn ???? were is the law

my daughter was surfing and a pop up came on and before she new it she was signed up and receiving bills of $10 a month how can a company sell pornographic material to a 14 year old. We have for the last 4 months tried to stop the billing via text's phone calls and even via our service provider without any success. this should not be legal