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.
Support is open from 5am to 9pm Pacific time
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
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I just filed my taxes yesterday and I had a 20% off coupon with a service code of [PII removed] which I just got in the mail day before yesterday and it didn't take the 20% off it doesn't expire till April 1st 22