On Dot Couriers — missing of courier

i have posted courier on 23/05/2015 form jassur distt kangra himachal pradesh to sun pharma Industries Ltd. C-52 Industrial area, Phase-3, SAS Nagar Mohali State-Punjab.It's not reached at it's Destination and when i track my docket no. it doesn't give any response. When i called to your customer care he also telling me this docket no. is not valid. Please ensure me that where is my courier. It's very important to me because i have post very important document in it.I have also attached the receipt of your courier with this message. If you will not solve this problem in between 12pm tommorrow date28/05/2015 i will go to consumer court for claim because i m with proof. docket no.[protected] manifest no. 1573048 i have also called to your ambala office no. [protected] he also told me that your docket no. is not shown in our database.