Refuse to return after 10mins purchase

<p>I upgraded my contract today and received a boxed Samsung S8.</p> <p>After looking at the phone and discussing the phone with my partner 10mins latter, I asked the store salesman if I could exchange the pup e for the S8 plus. He's words to me was that I could do it.</p> <p> </p> <p>I am very unhappy. And have asked the store manager to exchange it. They refuse to help me. And the phone is not even 3 hours out of the store.</p> <p> </p> <p>I have contacted cell c head office and they too won't help me.</p> <p> </p> <p>I would like to know if I take this to the Consumer protection association, they will let this happen.</p> <p> </p> <p>I have read the act and it clearly states that I have a right to choose what I buy. I purchased the phone. It is my property. And I want to exchange it within the a 10 min period. And get refused.</p>