I need to cancel my Typekit membership now before I get charged for renewing fees. I don't how to contact the customer service.
I'm sorry that Typekit didn't work out for you! You can cancel your subscription by clicking the “cancel plan” button at the bottom right of the Typekit Account page:
There is more information & a screenshot in this help page:
If you have any questions or problems cancelling, please send your account information to firstname.lastname@example.org, as Pattie mentioned. Thank you,