Thank you for reaching out.
As suggested by Sreeju above you can create a support request and select service type as "ExpressRoute Service Provider" and the support engineer will help direct you to the correct contact internally.
If you do not have an Azure Subscription or a support plan, then you can reach out to the alias I will share in the private message here.
PS - For any community member with similar request, as I cannot share the email address publicly here on the forum. I kindly request you to create a new thread and I will share the contact via private message.
Thank you!
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.