Guys, for SMU DE you don't have to fill study center details. Ideally, provide Sikkim address details and you're good to go. You're yourself creating trouble by providing center details while filling out the form. That's why you guys are getting query emails on your application.
Note: When I had applied for the ECA, I simply mentioned Sikkim University address and the process was smooth.
I've been getting personal messages on this forum to overcome this challenge. So, I'm posting here so that you'll are updated on this scenario not to do the basic mistakes. Hope this helps.
My timeline was:
Application Package + Transcripts delivered to IQAS: June 20, 2018
AOR2: July 20, 2018
ECA Soft Copy: Sept 22, 2018
ECA Hard Copy: Sept 27, 2018
Masters Equivalency.