How do I pay my outstanding balance?

Have you filed the return yet ?   And is it the federal or a state balance due ?

It's the amount due for using the turbotax prep service. I owe TT a balance and I cannot find anyway to pay. It said it will auto draw the amount from my card on file, but it never did.

First I highly suggest you wait until at least Thursday to call after the rush has died down ...

To contact TurboTax customer service/support use their contact website during business hours.  If the problem concerns any type of refund for fees, use the key words billing issues and do Not use the word Refund or you will get a phone number for tax refunds.

Submit your question/problem during business hours and then use the option for Call (a phone number will be provided for Call) to speak directly with a TurboTax agent –

https://support.turbotax.intuit.com/contact/