LT Online Store — Received expired Antivirus key

Address:

D. M. Dhadhi (Proprietor) Gr.17, Podar Chamber, Store Lane, Near RBI Bank, Fort, Mumbai 400001

I have purchased "Eset internet security antivirus " on 10 march 2021 from Ltstore online website. After making a the payment i received the key on the same day after a couple of hour via email. When I used the same key to activate the same antivirus then it showed "the license key you have entered is expired".
The company's customer care number is not reachable and also they are not replying to my mails.
For the reference I am attaching the following photos
1- invoice
2- error message
3- received license key