St Courier — Delay in delivering the courier

Address:

Chennai, Tamil Nadu, 600097

The courier person promised to deliver the product in 1 or 2 days maximum but now its been 6 days and still its not delivered.
They said it can be tracked after few hrs but now all data i find is that the consignment number is incorrect.. I can't sort out if the product is in safe hands because it has some valuables in it.
They are charging more for fast delivery and customer care response is very poor and harsh..