I have recently discovered a similar "crammed" charge from OAN on behalf of Greentreedata on my own telephone bill. Upon further investigation, I find many complaints of this all over the internet, but no one seems to mention any resolution.
I tried to contact OAN/Greentreedata by phone and web, with no luck. All I got was a "mailbox full" message. So I called Verizon. The girl there told me not to pay the bill, that they would take that charge off the bill and issue a new bill. When I got the next bill, it contained a disconnect notice because I didn't pay the previous bill! When I called Verizon this time, the woman insisted they would never tell you not to pay the bill (makes sense in retrospect--they need to fire the woman who told me that). The OAN/Greentreedata charge was still on there. Tried to call again, got the same message. Went online and filled out yet another request for contact from their customer service. Crossing my fingers, but I don't think this is going to help.
Has ANYONE had any success removing these charges?