I received an email to finish my taxes and receive a 20% discount. I clicked the link and the discount does not appear on the billing statement?

No one in the user forum can resolve a billing issue.  If you have a question about your TurboTax fees or billing, make sure you use the word “billing” in your request for help.  Do not use the word “refund.”

https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number