Promo gone wrong due to systems.

Bad service from Maphonya mall Edgars and customer care line. I brought 2 pairs of shoes from Edgars Eastgate on the 2nd Nov 19. 2 days later I heard an advert about buy 2 pairs of shoes and get 50% off the cheap pair. So on the 3rd I went to Maphonya Edgars to return the shoes and re-purchase them again so i can qualify for the promo. Guess what?, shoes could not be scanned as the brand is not sold at that store. Is it Edgars using one system(edcon vision)? Which are link to one database? I was not educated that thing not on the floor, cannot be scanned. Does it say on your T&C? Are customer educated about that? no no no. I have lost out on the promo and it is not fair. I could have save R800. Which is a lot of money in this tough time we live in SA. So I called the call centre that day, stated my query and story. Was told turnaround time is 48hours. guess what? no call until I had to call today 8th Nov 19.Guess what my story was written incorrectly, please train yourself to write correct things. Spoke to a guy named Kagiso, who could not answer my questions or concerns. He advise that he could not assist me. Its my loss and nothing he can do for me.