If you have already filed your return, you cannot cancel it and get a refund. We don't charge an e-filing fee. You were charged a tax preparation service fee. You can amend your return if it is rejected. After you click Transmit Return Now, your e-file goes to pending status where it will stay until it is rejected or accepted by the government.
You have the option of either fixing the rejection and trying to e-file again, or filing a paper return instead.
I have attached more information for you explaining this in detail.
https://ttlc.intuit.com/questions/1900890-can-i-cancel-a-pending-return
https://ttlc.intuit.com/questions/1901176-can-i-get-a-refund-of-the-e-filing-fee-if-my-turbotax-onli...