You can erase your return and start from scratch as long as you haven't submitted payment, deducted the TurboTax fee from your refund, or registered.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-online/00/26444
Please see the following FAQ regarding a refund for TurboTax Online products.
https://ttlc.intuit.com/community/charges-and-fees/help/does-your-unconditional-60-day-money-back-guarantee-apply-to-turbotax-online/00/26340
Please use the following link to contact Customer Support for further assistance as we are not able to assist with billing issues over AnswerXchange.
https://support.turbotax.intuit.com/contact/