Why was my account double charged market data fees?

Subscription fees are assessed based on the number of users subscribed to the service on an account. If multiple users are subscribed, there will be multiple charges assessed to the account. The market data fees displayed in Client Portal and the website are per month.

Find more information on market data fees on our website. 

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Are market data subscriptions per symbol or per exchange?
I have just opened my account. Why can't I see market data?
How can I select a specific account within Client Portal?
How do I request that my personal information be deleted?