Is Dell Customer Support so careless to me?

well, I purchased Dell Inpiron 3542 with Windows 8.1 Pro OEM

and been using it since half a year or so, and now I want to downgrade to windows 7 Pro because that's faster and more comfortable to me.. check this article, yes its free of cost but just for OEMs

support.microsoft.com/.../2832566,

Now I'm wasting 2 hours of my time already while debating with Microsoft customer support as well as Dell Support on phone again and again. and they just won't cooperate at all, whats the matter? aren't us your legitimate customers, now please some one kind enough there to help?

I'l send Express Code or Service Tag in private message, just some one please help me out.

Thanks