First, here's to stop your Advantage membership (annual subscription):
https://ttlc.intuit.com/questions/1901052-how-do-i-cancel-my-turbotax-advantage-subscription
And here's an online refund request form. Submit it within 60 days of having received your product.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-refunds/request-refund-turbotax-p...
