Sterns Bad after sales service

On the 19th of May i bought a rose gold wedding ring from Sterns at Menlyn mall. I got engaged on the 18th of June . Approximately a week later the ring cracked open at the bottom where it was resized . Which they repaired . After that my fiance ***** the ring for a week then saw that two of the diamonds fell out . We immediately took the ring in and now we have been waiting a week and a half for feedback . I have to constantly call them . Their is no after sales service or getting back to me . Everytime i go to family and friends events they want to see the ring . Then i have to look at the disappointment in my fiancé eyes and the embarrassment that their is no ring to show. In a time period of 1 month she had the ring for less than two weeks. . When i contact sterns the lady that answers sounds like she doesn't care and has very poor after sales service . ***