First of all, please reach our support team by Chat button immediately.
Secondly, please close time slots that would be affected right away if you still have access to adjust your schedule on Calendar page.
Thirdly, it might be a good idea to take some screenshots or photos of your issues. You can send these pictures to our support team by Chat so they can offer further help or submit them as evidence when you need to appeal this issue afterwords.
Please check your devices and internet connection before your classes every day to help minimize potential issues.