SkyKing — Courier promised to reach in 4 days but it took 8 days

Address:	Kolkata, West Bengal, 700007
Website:	www.skyking.co

The courier was given on 2nd July in Kolkata at the Girish Park office of skyking and they claim that the courier by rail reaches the destination maximum in 4 days. For the last three days I am trying to contact the concerned authorities regarding the same and they are telling that the parcel will be delivered the next day for sure. Today is 8th July and I haven't received my parcel till now and now the concerned authorities say that I will receive the parcel tomorrow that is in 8 days.
the company staff does not know how to talk to the customer and instead of being apologetic they are talking to me rudely
Sonu Kumar claiming to be a staff of the company misbehaved with me and when I told him that I would complain to the consumer forum he asked to do whatever I feel to.
My consignment number is[protected]

I want a written apology from the company and delaying compensation from the company