Why can’t I complete the tv series I want to buy?

I have purchased four episodes of Season 2 - sg1. I now want to buy the entire season but I want to pay the complete my season price. No matter what I do, sign in and out of iTunes, restart my iPhone, my iPad and tv store on my Mac the iTunes Store will not update the price.

Could someone look into this and let me know how to give you guys money without me being fleeced at the same time. Happy to pay $29.95 not happy paying nearly $40.