Checking with GPT Plus account, but runs into account error for the past 4 days

I have been trying to check my account on ChatGPT Plus after a month of use, but everytime I follow the instructions and encounter this error. So far I have tried this using Brave Browser, Edge and Google Chrome and encounter the same result, and writing on their chatbot reply has no response for the past 2-3 days. What can I do?