Once you have given your email ID to magicbricks they will never stop emailing you. You can unsubscribe, you can explicitly ask them to remove your email ID. They will keep replying with auto responses saying the email ID will be blocked, but the emails will keep coming back. like a disease!
If a company does not have the ability to complete such a simple request, how can they be relied on for the more complex task of a property search? How can we trust them with our personal data?