India Post — non-receipt of acknowledgement card of speed post

Address: 560066

I had sent 3 letters (On speed post with ad) from bangalore gpo 560001 to police department, bangalore on december 05, 2017 at 16:26 hours. I did not receive the acknowledge cards for any of them. 3 consignment numbers are :
Ek[protected]in
Ek[protected]in
Ek[protected]in

Gstn number for all the 3 cases is 29aaagc0184l1zc.

Kindly look into the issue as it is very urgent.

Thanks,
Neepa mozumder