If an employee doesn't help you here, contact one of their Billing reps at the phone number on your bill or 1-800-Comcast, chat with them using one of the "Account and Bill" options at https://support.xfinity.com/chat, or visit a Service Center if one is nearby (check locations and hours at http://www.xfinity.com/support/service-center-locations/) and have them reverse the charge.
In addition to getting the billing corrected, consider setting up a Purchase Pin on each of your cable boxes/DVRs to prevent this from happening. See https://www.xfinity.com/support/articles/how-to-block-purchase-of-pay-per-view and/or https://www.xfinity.com/support/articles/x1-parental-controls-turn-puchase-protection-on-off.
Hello Bryonk. I can assist with review the movie purchase and help you cancel this. Please send me a private message and include your full name, service address, and account number so I can assist you.
My 10-year-old son mistakenly rented "Mission Impossible III" tonight, as i just learned from this email you sent me:
"Thanks for your recent rental of
Mission: Impossible III HD for $3.99."
He will not be watching it. Please refund $3.99 to my account.