Day 6, 21/6/15: Well, since I had not received any mail from Apple yet and I guessed its been too long since I mailed them my identity proof documents, I decided to check out the registration email I had received earlier. I clicked on the activation link and voila! My developer account was activated.
Now with my account ready, I have tested my first game on my iPad and it is ready for publishing. My game, BugRun, will hopefully be up soon!!
Mayank's Workshop 
Thanks for writing about your experience. I am curious though, how is/are your apps doing on the app store – are you seeing a lot of downloads/revenue?
Hey, I published 3 games onto the app store and then got busy with acads and other work. Yeah, I do see some revenue, not much though. I’ll publish a blog post about it soon…
Well my story is a lot similar to yours. I have applied for the Apple Developer Program today with my Dad’s credit card and got two mails which you got and when I click on my activation code it says “We are unable to activate your Apple Developer Program membership”. I am waiting for any other activity from their side. I found your article useful! I want to ask about the name of developer of your account, is it your’s or you Dad’s?
Hey, glad you found the article useful. My developer account is in my name.