DTDC Courier & Cargo — non delivery of letter/consignment no z 80181061

I have booked the letter for bangalore on 31.12.2018, from allahabad. Consignment no. Z80181061.
Status shows "office closed or door closed". This is strange as the letter needs to be delivered to a flat in a big apartment, family members are always there. Hence, it is ridiculous, incorrect.
In spite of the fact that i contacted over phone on 3.1.2019 and 4.1.2019. Letter has not yet been delivered.
May i hope that proper action will be taken against the erring officials! Further, necessary steps may immediately be taken to deliver the letter at the given destination under intimation to me.
Regards,
Ranjan ukil