If you have the order number use this website to make a payment - https://payments.turbotax.intuit.com/
Or -
See this TurboTax support FAQ on how to contact Support - https://ttlc.intuit.com/questions/3401489
Submit your question/problem during business hours, use the key words billing issues, then use the option for Call (a phone number will be provided for Call) to speak directly with a TurboTax agent -
Note: The Call option will not be available when TurboTax Support is closed.
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax