They **** me

My name is Mukheli , I sent my wife diamond ring for resizing and they told me it will take 10days maximum . 7weeks later after I went there millions times to check for it , it. Came back with diamonds stones missing and they are telling me to take it back like that and they won’t charge me or they have to take it back to resize the diamonds area so that it can fit the remaining diamonds and it will cost me extra R4000. I refused to take it back and they are threatening me to throw it away. This is fourways mall branch. I need help with legal action please .