Xpressbees Logistics — Delivery address PIN code change and delivery delayed

Address:	Hyderabad
Website:	www.xpressbees.com/track

[protected] this order number PIN given for delivery is 500008.
And promised date of delivery is 6th-10thMay.

7th May
XpressBees they themselves changed PIN to 500032 without informing the receiver(ME) or the sender (1mg).

11th May
I enquired on with 1mg they said, delay from the delivery partner side.

12th May
Called Xpressbees, said PIN number was wrong that's why the delay and package is in wrong place.

Called 1mg, they said they cant do anything but wait till 16th-19th to get the package or cancel the order and get the refund.

Complaint :
Why Delivery company change PIN number themselves without consulting Sender or the Receiver, and why same thing is shown as reason for delay in delivery.