Bad service that i got from Sterns in Centurion Mall.

On the 13th of Feb 2018 my hubby went to Sterns Sammy Marks Pretoria to buy me a ring as a suprise for Valentines day. It was a silver and blue diamond ring for R599.90.It was silver with blue Diamond and few small diamonds around it. After 3 days one of the small diamonds started falling off and after 5 days there were about 3 of them out already out. I took it back after 6 days i took it back to Sterns in Centurion Mall and i found a lady by the name of Musa. Musa told me she cant give me another ring becouse i did not have the slip and what i am showing her about the diamonds falling is not posibble,and she was giving me attitude and also told me that i can report her theres is nothing that will be done to her when i ask her for Head Office numbers and the managers number. I then phoned Sammy marks and i talked to Patiance who helped me to exchange without the slip and i took another one which it was less with R100 and she even gave me change of R100.The sales lady in Sterns Centurion Musa the one who refused to help me with an attitude,when i went back to tell here that at Sterns Sammy Marks they helped me she still gave me bad attitude by saying there is nothing that will be done to her and she does not care if i am helped or not becouse thats not her problem becouse from the beginning i did not buy at Centurion.i felt bad becouse what she refused to help me with i got helped easly at Sammy marks by the name of Patiance which i am grateful to her.i also had a chat with Patiance manager at Centurion but she was not much of a help becouse she did not say anything.