Poor Workmanship & Terrible Customer Service!!!

In December '14 My husband purchased an engagement ring from Galaxy & Co. I noticed in June that one of the small stones had fallen out. I went to the store to ask what guarantee they offer, to which I was told none at all (Less than 6 months old) I accepted it and advised that I would keep the ring until I received my wedding ring as to avoid having to walk around bare handed. In August '15 my husband returned to galaxy & Co to purchase my wedding ring and after paying for the ring, as the lady was cleaning it a stone fell out! The ring was then sent away for 2-3 weeks. I received my ring on the 6th September '15. I wore it for a week and A STONE FELL OUT AGAIN!! I took the ring back to the store and I was told that they would need to send the rings to head office and I will receive a quote within 3-4 weeks. I followed up after a month and was told it was still being assessed, I then contacted head office who advised that they were investigating and a day later the store called me to tell me the rings were back in store and the cost was R205.00. I did NOT receive a quote! head office mailed me to advise that the damage was due to wear and tear! I had it on my finger for a WEEK!!