Where to ask to delete Microsoft 365 Developer Program account (profile)

This is the final report.

https://visualstudio.microsoft.com/ja/subscriptions/support/
https://my.visualstudio.com/GetHelp

After creating the first support case above, the followings have been done.

1) They ask me to create a new support case again after signing up for one of the following paid plans in Personal/Business/Enterprise

https://visualstudio.microsoft.com/ja/vs/pricing/

2) The following response was received

- The previous Microsoft 365 Developer Program account will be automatically deleted on 2025/4/4

- However, the phone number will be linked 60 days later

- They ask me to create a new support case at that time to see if my current company mobile phone number is available

3) Based on the above response, it has become clear that it will take time to resolve the issue.

I plan to change my phone number soon and join the Microsoft 365 Developer Program

That's all.