Unable to delete wp-content/plugins/si-captcha-for-wordpress

I need some help here.

I am using Cpanel’s Fantastico to help me in my wordpress installation.
Previously, I had it installed perfectly well and threw in some plugins along with it, but turns out there was some plugin error due to WP versions and i did not do a backup so I decided to start over by deleting the whole wordpress and subdomain.

The nightmare begins when I re-installed my wordpress. I kept seeing the folder (MY-SUBDOMAIN NAME)/wp-content/plugins/si-captcha-for-wordpress) reappearing even after I manually delete it in my FTP and also through cpanel’s file manager.

I tried deleting just the wp-content alone but the folder (MY-SUBDOMAIN NAME)/wp-content/plugins/si-captcha-for-wordpress
remains there even after i refreshed, clear my cache, log in and out and restart my computer.

I believe that /plugins/si-captcha-for-wordpress is causing the problem for me to reinstall wordpress.I hope to use back my existing (MY-SUBDOMAIN NAME) to install wordpress again.

Is there any way I can remove the wp-content permanently and cleanly,
or should I contact my local host?