Jabong.com — tracking details are not getting updated, shipment stuck at a place for 4 days

I am a new user of Jabong and I have ordered my first product from here.
I ordered on 10.02.2018 and the promised delivery date is 16.02.2018.
From 12.02.2018, the package is present in Mumbai and no further process is being followed.
It's been 4 days since the package has been in Mumbai.

The AWB number shared to track ML courier services, is showing invalid id.

I have done the payment in full. And also mailed the customer care about the same. Now, they say that the courier will be delivered on 18.02.2018 which is Sunday(As I have opted for Office delivery ) but it is not getting reflected in their site/app.

ML Services customer guy is abruptly dropping the call.

aWb number is - MLJP2788632

Very disappointed.