Q: Can i get to know if the user i have blocked ever called me ?? Do i get a notification regarding that in any possible way ..! ?

Dr. Anirud, here are some details on blocking:

They are not notified that you blocked them. If you want them to know, you would have to tell them. Blocking prevents delivery of the message. Undelivered blocked messages are not stored for later delivery. Unblocking resumes delivery of that person's new messages. Calls roll directly to voicemail. You can navigate to listen to them or not as you choose. If you send them a message they should receive it as blocking is one directional. Here are more details:

Block calls and block or filter messages on your iPhone, iPad, or iPod touch - Apple Support

Hope this helps you,

elcpu