Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear Junito80
Thank you for reaching out.
I understand that you need to cancel your dev subscription. I have gone through your concern, and I would like to apologize for the inconvenience that this has caused you.
As per your post, considering this might involve access to your account sensitive info like credit card and other personal information, I do believe this can be better checked and handled by our billing technical support team. You can contact the team via Phone support to check for your account details and payment methods as well. Something we may not be able to do as public Forum support.
Below is the document to contact Microsoft 365 Business support team via Phone support. (Please check the number/s within your country/region).
->You can also refer to phone numbers in Global Customer Service phone numbers - Microsoft Support
Thank you for your kind understanding and have a great day.
Best regards,
Eleni | Microsoft Community Moderator.