Open Dolphin Zhihu official website and click Login.

After logging in successfully, find "My".

Then click online customer service to apply for a refund.

Or call official website directly and press the button to turn to manual customer service for a refund.

Dolphin State Education is an online and offline comprehensive education science and technology group focusing on fast memory training and mind mapping, with the core of improving the learning ability of teenagers and the learning ability of enterprise presidents and executives. Established in 2007 in the beautiful coastal city-Xiamen, China.