Passport Office Mumbai — passport returned not able to track now

Address: Thane, Maharashtra, 400601

I have applied for change in spouse name in my passport at thane passport seva kendra on 23.05.2018.
The new passport was delivered at my place on friday i. E 8th june 2018 but was returned back with a message left from post office to collect the same within 5 days.
I returned back to thane on monday i. E 11th june and on 12th june i have send my authorised representative to post office but they informed that it is not with them and they have no idea.
Now i am completely clueless... I have tried calling office of regional passport office but no one picks the call...
Please dispatch my passport again on the given address.
My details are
Name akanksha sharma
Earlier passport number h6314779
Date of birth 30.01.1989
Mobile no [protected]
Address 1002 c wing michelangelo lodha luxuria priva majiwada thane.

Please reply and resolve my problem... And get delivered my passport.