i want to downgrade from ios 7.1

I simply want to downgrade my iphone from ios 7.1 to ios 7.0.6 and i do not know why you are preventing me from doing this. I have purchased a product from you and should be free to do what i want with it and in this circumstance i want to downgrade. I have been a long apple customer with multiple products and I am hoping that you will be able to resolve my problem by allowing me to downgrade.