You can use this plugin lifetime but update and support for one year. (see again https://www.shamimsplugins.com/terms-and-conditions/ which you agreed during purchase )
It will not be auto renewed, After expire if you want you can renew, otherwise you can use this plugin lifetime without renew your license.
If you still want a refund just contact me using https://www.shamimsplugins.com/contact-us/