Here is the link to request a refund
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-refunds/request-refund-turbotax-p...,
you would fill it out accordingly and they should give you a response within 24 hours. Please note that the response is via email and that email will have a 'case number'. Do not get rid of that email as you can track the request with it and/or the case number can br given to product support to investigate if need be. Also, be detailed in the box and specifically say you were charged double for a state but you only bought one
