Idp Ielts — Delay test result

Address:	Mohali, Punjab
Website:	IDP ielts

My ielts test was held on 16th june 2016.
Result supposed to release on 1st of july 2016.
But i am still waiting for and real satisfactory update form idp.
I did receive one an email from idp about investigation which was being performed by idp partners due to some security reason.
But i am very disappointed with the service provided by this international company.
I have not received any fixed result declaration date.
I am struggling to get more clear information form their customer service. as their customer service is foolishly reply my phone calls and seems like passing ball to other branches.

This delay has disturbed by future plan.
I am not sure how can i make proper complaint about this issue.