If I understand correctly, your paid your annual limited liability company tax for 2019 on March 19, 2019 but did not file your 2019 Form 568.
You received a notice from the Franchise Tax Board that you did not pay for 2020 annual limited liability tax by April 15, 2020.
If you dissolved your LLC in December 2019, you do not owe the 2020 annual limited liability company tax because your LLC did not exist in 2020.
You should file your final 2019 Form 568 and tell the FTB that you do not owe $800 for 2019 because you dissolved your LLC in 2019. Include a copy of the Form 568 you are filing.
If your notice has a fax number, faxing is preferably to mailing. Send any mail certified with return receipt so you have proof of delivery.
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