Question about bill - how to contact by email

I have questions about my bills belonging to dyndns.org services.

But I can't contact Oracle by email.

I could call Oracle but i think this could be a nightmare to get the right person.
Email will be more effectiv, they can be fowarded to the right person.

It's important to me to clearify this questions to my bills. Dyndns account has been removed.

Could someone please start the contact via email?
Anyone there who has this possibility?