Exchange impossible with managers who are untrained

I bought a sling bag on the 9th of this month, i noticed that the bag stitching is loose then went to mall of africa to exchange the bag as i dont have a receipt but the staff was so rude.. They told me it was gonna be a long process to get a slip on the system. So i asked what was the way forward but the staff member took me from pillar to post just to exchange a bag. I need to change this bag can someone who knows what thy doing call me. Thato mall of africa clearly needs training on being a superviser. Even when i asked his name he just said you can see it, and there was no name badge so he just told me his name and walked away.. Store managers and supervisors needs to go for training for customer service just disappointed