India Post — my consignment

I am a reseller from guwahati assam. I do business from my home. My problem is that i ordered four piece of lehanga from a wholeseller of surat for selling purpose. I made payment in advance. She send it from speed post from surat gujrat on monday 11/9/2017. She send me courier slip with consignment no
Cg[protected]in. But whenever i try to track this no it always shown that consignment not found.
Please help me as it was very urgent.