Bad customer service

I was at Edgards centurion mall to exchange the male T-shirt (guess)@ 17:40 on the 05/12/2015,I approached the consultant by the name of Joseph to ask if they have the bigger size of the T_shirt I want to exchange, only to find out that they didn't have he then suggested to check on the system, for some reasons he wasn't able to access the system, another consultant by the name of Sibusiso came and checked for me on the system and the system showed there's stock ,but on the floor there's nothing. I asked Joseph to call the manager for,the manager came and she said probably the stock must be in the store room ,she took the picture of the T_shirt and my contact details and she promised me that she will give me a call on Sunday latest 10am because I was leaving to Durban, up until now I haven't received a call,so I'm not sure what does it take in edcon to make someone the manager.or what the customer service means..empty promises. I will never shop that that store ever,I will actually close my account .