I need to cancel "audit defense membership I bought by accident.

[Critter]

If you already paid you cannot get a refund ... if you have not paid yet ...

How to see your fees
https://ttlc.intuit.com/questions/2565973-how-do-i-review-my-fees-in-turbotax-online 

For help with fees
https://ttlc.intuit.com/questions/1901213-what-can-i-do-to-reduce-my-fees