India Post — Registered post not delivered

Address: Mumbai City, Maharashtra, 400019

Website: www.indiapost.gov.in

I had done a registered post on 06.08.2016 on registered id: rm[protected]in. it still shows as pending and even when i have registered a complaint on the website dated 19.08.2016, it still shows that no one in india post have time to revert to customer complaint..
Its 26.08.2016 today almost 20 days are past and still i cannot trace my letter.
Please help me to resolve the at ant earliest

Registered post id: rm[protected]in
Complaint of registered post no: [protected]