I bought a Sumsang phone at Vodacom chat and returned it within 7 days as it was

Good Day, I bought a phone at vodacom chat east gate on the 26th Oct 2017 and returned it back to the shop on the 30th Oct 2017 because of faulty buttons. I have been waiting for vodacom to give me a new phone since then. When i returned the phone i was told by the manager Khethiwe to keep the box with me and leave the phone with them, two days later I got a call from a sales person to return the box which i only managed to return a week later. When i returned the box the manager in charge told me i wont get a new phone immediately they can only give me a repaired one in a day or 2 days as they are sending the phone for repairs. Which they only phoned me a week later to say I can come collect a repaired phone as they wont be giving me a new phone because I did not return a box a day after they gave me a call. My Argument is I returned everything within 7 days but Vodacom is does not want to take responsibility and they are twisting the whole thing and making it my fault because of the box. I still don’t have a phone as I m typing this email

Kind regards Fikile