I contacted Nancy from- Yancheng Chaoda Glass and Lab Product Co., Ltd about an order of interest. Almost immediately she was exceedingly rude asking me to use email and that I was unprofessional for using the built in IM system despite the fact I said "ok" and she kept replying. I outlined my list of items and asked for a quote which she never delivered. I requested also that I wanted to have a look at 2-3 items for quality and would pay for the shipping on these. She came back with a quote of 360USD for these samples. Despite the fact I rang the courier company DHL earlier and they quoted me approximately $30-60USD. I then asked her why this price was so high being fishy. She then accused me of being petty and not a legitimate buyer and trash eventually at the end of some heated insults then threatening to report me to alibaba and for some reason the embassy of my country. I have never ever received such bad customer service. Absolutely awful that this company is allowed to operate like this. I highly recommend to everyone to never use or buy from them. They will abuse you and rip you off.