Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Michael,
Thank you for reaching out to the community I understand you were billed multiple time for your Microsoft account and if you were able to verify the charges to your account the next thing you can do is reach out for the Microsoft Billing Support. To reach out for the billing support please access this link admin.microsoft.com sign in and look for Help & Support menu and from there search for the issue like Billing and select Contact support to request a callback.
For the customer service support number this will varies by region and if you would like to check the phone number for then please copy and paste this link: https://support.microsoft.com/en-us/topic/customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2 .
I hope this answer is helpful if you have further questions feel free to reply back
Regards,
Marcelo