From the Account Dashboard, there is a billing section to view all invoices and add/remove or replace your credit/debit cards which are used for payments on Tuned.
This is accessed by clicking the top right of your screen, where you see your first name. From here you'll want to click on Account Dashboard, and then go to the Billing tab as shown below.
From Billing, you may replace your credit/debit card with new information. Below this, is a history of all past and current invoices, based on the syndications you subscribed to. Each invoice can be viewed, to display additional details, like the image below.
The invoice information consists of the Invoice Date, Invoice Status with the subscription fees and other data. When reaching out with a billing inquiry, make sure to provide your Tuned email and Invoice Number to whoever is helping you.