The class you bought is of poor quality and you are harassed every day. You were kicked out of all the groups when you asked to leave class, and then there was no refund for various reasons.
It's no use complaining about Haikou 12345, so we can only sue them. Don't listen to the students' bravado about this rubbish company.
Go to Haikou 12345 and search Hainan Tangmeiyu Technology Co., Ltd., and you will know how shameless this company is.
Looking up, dozens of lawsuits.