Tired of running after people to provide a service

On the 8 November i purchased a R4999 jumpsuit from Fabiani woman, i was inlove with the style and design. I took a size bigger than usual i was i planning to wear it for a wedding and wanted to be comfortable. I wore the jumpsuit for about 3 hours and discovered the seam/stitching was going loose to my surprise i didnt expect for this to happen as it costed R4999 and from Fabiani????

i then returned it to the store and the shop assistant sharon informed me that she would have show her area manager and he would have to make a decision and she would call me the next day or monday with feedback. I didnt receive a call by the monday so i called the afternoon and sharon informed me she sent to Head office for the QA people to have a look at it. Yesterday i called again as i was expecting some sort of feedback but never received any. I called again today and sharon said she spoke to the planner Bianca about the jumpsuit as they were still looking at it. I asked for the area managers details so i could find out what exactly is happening as R4999 is not pocket change. Sharon gave me Bianca's details who is the planner which i was very confused that sharon spoke to her about the jumpsuit. I called bianca and she claimed to know nothing about the jumpsuit and couldnt understand why i was calling her. I called the store again and sharon then said she spoke to her area manager who said the garment can be exchanged for another but i dont want another as the first garment was faulty and i dont want to take the chance for something to happen. I tried calling the area manager but he kept on rejecting my calls. I am tired now of calling and begging people to assist me as i was given this garment for free. I pay for quality and expect to receive some sort of quality service.