Dtdc Courier — wrong delivery of important docket

I have a inbound packet from India Infoline Limited, Mumbai consignment no# C[protected];

1) it has been delivered on some wrong address..?? I was told that DTDC will recover & deliver within a week..................??????????
2) for more than 3 weeks of complain filing there is no response..? despite regular followup..?
3) when try to contact customer support, either phone is engaged or there is no response..!!

This is POOREST of customer response, I have ever seen in all the times...first you do mistake, accept & still can not rectify the same. please let me know someone responsible who can help & solve this problem..in absence of any response, I'll be forced to take different measures.