Apple TV Free trial

I received an email from Apple with a receipt for Apple renewal from iTunes. First I do not have iTunes and I did not authorize it. I recently bought a new Samsung TV. It came with a free trial, which I activated. The free trial expires the week of the 9th of October, which I noted on my calendar . Please remove this charge and advise me on how to cancel this free subscription before it is due to expire. I will be notifying American Express of this mistake. I look forward to hearing from you.... Thankyou

Carmen Flynn