AMERICAN SWISS - poor workmanship

I got engaged last year November. The ring is from American Swiss and cost my fiancee R70 000. After the engagement I took the ring to a jeweler to resize and the jeweler showed me that one of the very small diamonds are missing. We took it back to American Swiss to be replace witch they did. It happened a second time after a month or two wearing the ring. So we took it back again and insisted on a new ring. They replaced the ring. I had the new ring 2 days and then noticed that again one of the small diamonds where missing. We went back to American Swiss. The took the ring to be inspected and informed us that it was due to "customer damage". I do not wear the ring when going to the gym, showering or any water related activities. Not even when washing my hands. I have a normal job (teacher) and I feel that if the ring can't withstand my daily routine (that is similar to the average person) the quality of workmanship is really poor.