St Courier — my courier was not delivered missing

I have given my parcel on 14-jan-2019 in ulsoor, bengaluru with consignment number as [protected]. The courier office person said like that courier will be delivered on 17-jan-2019. Today i didn't receive any update from st courier and not able to track my parcel. I have contacted ulsoor branch, there is no proper response from branch office. Based on that parcel, i have planned lots thing. It's all got spoiled and such poor response from st courier. This is kind of service never ever seen with any other courier service. Myself highly disappointed with your service and consumer response. Interesting thing is my consignment number was invalid awb number in tracking database. I want clear information about my parcel and confirm about whether is st courier or not.