Not trained properly in the field they work in. Very disappointing service at American Swiss Kathu

I am very disappointed in the service we got at American Swiss Kathu. This has been coming for a while now. When youn want to pay , they are always off line. Tell you to rather bye online, (never offer to order for you) because they do not keep certain items. And today, the people working there has no idea of what they are selling. No knowlege of what diamonds, created saphires or other gemstones are. Why are they not trained to give the correct information regarding the products they sell? This is very disappointing , I will not recomend anyone to visit this store anymore , and I will definitely not support them anymore.