First you do not need to amend the return ... and second if you had entered the 1095-A form on the original return you would have been required to upgrade to the Deluxe version which has a fee. You can try to fill out the 8962 yourself on paper or contact TT support and complain until they give you a code to overwrite the fee.
Please use the following link to contact Customer Support for further assistance.
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
