DTDC Courier & Cargo — DTDC tadbund - unprofessional and poor service

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Dtdc tadbund branch

DTDC tadbund (bowenpally ) branch, have missed delivering my couriers twice. Everytime I had to track myself with those orders and reach their office to get my courier delivered.
Tracking ID -H[protected] WAS an important document and they dint deliver it for 3months. They just kept it with themselves. I had to track it and reach the branch people on phone and then they delivered it.
Heights of negligence...how can they even think of keeping any courier for 3months undelivered. Kindly take an action against them.