I visited your page, chose a Brand filter option, and could see the error in the browser console.
A 500 error on an ajax request means that there was a fatal error on the server while processing the ajax request, and you would need to look in your site's debug.log (or the server PHP logs) for more details.
The odd thing is that the request originates from an add-to-cart script coming from your theme, even though you are applying a Views filter, and a request would ordinarily come from a Views script.
So you could try switching theme for testing to see whether the filters work correctly or not.
But the page markup looks a little odd in any case, there seems to be the markup for 2 forms relating to the View filter controls (one of which is hidden), not one.
So I think it would probably help if we could access the back-end of your site to check things ourselves.
Let me mark your next reply as private so that we can get log-in credentials from you—you may want to create a temporary admin user for us to use that you can later delete. And be sure to have a current backup of your site.
Even with the default theme of the wordpress I'm still getting the same error and the filtering doesnt work.
yes I have check the logs and the error is
"[proxy_fcgi:error [pid 30128:tid 139788761687808 [client 93.109.231.98:0 AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Class 'OTGS\\Toolset\\Views\\Model\\WooCommerce\\WC_Tax' not found in /ho............me/394991.cloudwaysapps.com/jfmfvcakcz/public_html/wp-content/plugins/wp-views/embedded/inc/wpv-filter-query.php(825): WP_Q...', referer: hidden link"
