Zend certified PHP/Magento developer

Can I fix my DNS leak by blocking my ISP’s DNS servers IP addresses in Windows Firewall?

using https://dnsleaktest.com/
i can check for DNS leaks when using proxy, i notice when i perform an extended test, i can eventually see my ISP’s DNS IP addresses in there. i tried blocking them using Windows Firewall and i think i stopped the leakage, but i’m not 100% sure.

i need to know if what i did indeed is a solution to DNS leaks.