Unhappy customer

I have a problem I bought an air bed (campmaster) last year online on the 27th of September. I haven’t used it since until last month and unfortunately it had a fault it kept flattening while I was sleeping on it and air was coming out. So today I decided to return it to one of your stores in Jabulani Mall in Soweto since it is still within the warranty/guarantee. One of your employees Nokuthula Mthwala refused to help me and told me that I was supposed to return it within 7 days of purchase and I have to return it to the store where it was shipped from. First of all it’s not like I got to choose where I want the air bed to be shipped from you guys got to choose maybe depending on where the stock is I don’t know how y’all work. I just got to receive an invoice stating that it was shipped from Mall of the North so I don’t understand why must I return it to Mall of the North or South Gate. And your policy states that I can still return it if it’s within the warranty and get it fixed or replaced for free unless it’s after the warranty so I don’t understand the 7 days part and that I can’t return it to any game store, why? This is just a whole lot of inconvenience and I am so disgruntled.