What I want to ask is whether Guangdong Zhitian Precious Metals is a liar, and is there any company qualification certificate?

Go to the website of the industrial and commercial bureau to check. I just checked it for you. They are a comprehensive member of Guangdong Precious Metals Trading Center No.039, which should be a regular company. Although the company is formal, as friends upstairs said, don't trust their investment advisers too much, don't give them the accounts, and do it yourself.