Diamonds falling out, bad quality, AGAIN!

Last year January my fiancee bought my engagement ring at your Paarl Mall branch. In February we got engaged on a television show called Sê net Ja. Your store was shown in the show and got full exposure on television. Almost like a free advertisment. Since then I've only had problems with my VERY expensive ring. I had the ring made smaller and everything was fine, the ring was the correct size and I went on. After a while the ring broke where they had made it smaller. I took it back and your store send the ring away again. After a week I received a message to go and pick it up. I arrived at the mall quarter to six (17:45) only to find the manager locking up the doors and telling me to come back the next day. The mall closes at six (18:00). I went back the next day and fetched my ring. Then again the ring caused a problem. Where they had fixed the ring on the previous occasion the whole ring was turning black. I once again took it into your branch they tried to clean the ring but it just wouldn't return to the way it was. Once again they sent it away to be fixed. This time the whole ring was replaced except the diamonds or that is what the store employee said. Now about a month later one of my 91 diamonds in my engagement ring fell out. This is absolutely unacceptable due to the fact that my fiancee paid a hell of a lot of money and I have to drive to Paarl and back everytime! I trust that we could make some kind of arrangement to resolve this issue as I am considering asking my money back or getting a laywer involved. The service and product is of really bad quality. Please contact me at: ********** 867 **********