Poor service & selling defective parts

<p>I bought power bank at Cell C at Centurion on the 25th of May and I used it once and when I want to recharge it the outlet on it didn't work. I took it back yesterday 01 Jun and I was told by Lebo(assistant manager ) that he won't do anything because manager is not in today. He will decide what is going to happen when he comes back. I'm still supprised by the fact that it is within 7 days and their product is not working and I'm supposed to get money back or a new one. But instead I was told that the manager have to decide. I cannot drive to the shop every now and then because of this person is not here today. Please help. Their number is ***</p>