Stop using "Project Plan 3"

Hi @Yoji Nakanishi

Try using the following documentation to cancel your subscription:

https://support.microsoft.com/en-us/account-billing/cancel-your-microsoft-subscription-c2c6b0e3-cab3-cb98-d83e-c9ad54620530

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If this is helpful please accept answer.

Thank you very much.
However, I could not successfully complete the procedure.
Finally, I pressed the push number 1>>4 from the toll free number (0120-996-680). I was able to cancel the service by phone.