DTDC Courier & Cargo — DTDC Courier undelivered (Address incomplete or wrong - (CIR)

I have sent a courier from Kanpur to Lucknow (Zip 226003) on 16th April with the consignment number U15985195. This has very important documents and the online tracking now says not delivered (Address incomplete or wrong - (CIR). I gave 2 alternative numbers in case something happened and dtdc never tried to contact me on any of the for delivery and now says not delivered. They haven't sent me any communication of this either. I could only see this when I tracked it even though I went online and registered my phone for tracking. They haven't given me any details about my courier. How do I get it back? No customer care numbers or office numbers available. All numbers online seem to be wrong. They are very important documents and this kind of irresponsible service is outrageous.