Add the below code in thefunctions.php file of your current active theme to disable the vendors weekly stat report-

add_filter(‘mvx_enabled_vendor_weekly_report_mail’, ‘__return_false’);

To disable the monthly stat report mail you may add the below code –

apply_filters(‘mvx_do_schedule_cron_vendor_monthly_order_stats’, true);

This will resolve your issue but if you still face the issue kindly try to return false the above filter.