Please cancel my subscription

I need to cancel my subscription. IMDBPro is using an old credit card number that I no longer use, as it has been canceled and is defunct. Yet I see a pending charge of $149.99 from IMDBPro on my current credit card account. If I go to my credit card company, which is Capital one, they advise me to contact you, the vendor. That is what I’m trying to do. Please cancel my subscription before that pending charge becomes an actual charge on my Capital One account. When I tried to sign into IMDBPro (to cancel) I received a message indicating that I did not have an account, and I was invited to sign up for a free trial. I am confused. Can you please help me with this matter? Thank you in advance. ( I may sign up for IMDBPro in the future, but for financial reasons, I need to cancel my subscription at this time.) Sincerely, Marci Lutz