Did you cancel the Advantage subscription using the procedure as shown in this TurboTax support FAQ - https://ttlc.intuit.com/turbotax-support/en-us/help-article/change-service-level/cancel-turbotax-adv...
It may take a couple of weeks after you requested a refund for the refund to be issued.
TurboTax support is open from 5am to 5pm Pacific time, Monday thru Friday
You will have to contact TurboTax support for assistance with this problem. Use the key words Billing Issue
See this TurboTax support FAQ for contacting support - https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/turbotax-phone-number...
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
