Dear Sir,
I understand that you are upset that the TV show you purchased had advertising in it. However, I feel I should point out that the iTunes Store is just that - a store. We do not create any of the content that we sell, and we cannot legally alter it. We can only accept the content provided to us as is.
I would recommend you express your dissatisfaction with this TV show to the studio that produced it. They are the ones that will be able to make any changes, and unless they are made aware of the fact that consumers are unhappy with the included advertising, the show as it is on the store will most likely remain the same, commercials and all.
I hope you find this information helpful. If you have any other questions about this issue feel free to reply to this email and I will gladly assist you further.
Sincerely,