Is HTSS commodity trading center reliable?

In this April, the service of Guotai lecture pulled me into a group, in which shares recommended were all profitable. I also followed and earned a few. On May 7, the teacher asked us to open an account for Maotai trading, many followed. Seeing the profit screenshots, I had a try and deposited 8000, earning several hundred yuan a time. Then the group was dismissed June 10, the teacher asked us to add him to give one-on-one instruction. At first, he told us to trade on a small scale, which I felt trustable. I profited a lot and added another 300 thousand under his recommendation. I bought 600 boxes on rising market, while the market kept plummeting. He didn’t stop losses for us, blaming it on technical problem. I lost 200 thousand during this trading, but the teacher still conned me to add fund, saying that he would recover losses for me, which I refused. Then the salesman came to me and repeated the same words.