Bro, I've already got my ECA successfully for SMU-DE in the month of September. The issue which you guys are facing, was there before when i applied for the assessment. So, I was quite clear how and what needs to be mentioned while filling out the application form. You yourself put into trouble by mentioning learning center address (which you should not be). It's a distance learning education and the IQAS team will see it a mismatch if it's not matching with university address.
The email which you received, I've seen them before too (when I was about to apply for ECA). So, I was pretty clear with the issue and made sure that I didn't do that while filling out the application form. It's always advisable to go through with the forum and experiences if any important factor needs to be considered.