Indian Railway Catering & Tourism Corporation [IRCTC] — Journey reallocated in lower class from 2ac

Website:

www.irctc.co.in/eticketing/loginHome.jsf

I have booked a Ticket from Nangal dam to lakhnow (NLDM - LKO) having
Train Number - 04502 & PNR number: [protected] for my family.

I got Confirmed tickets in 2AC but after chart preparation my both confirmed Tickets upgraded into 3AC.

At 1PM when my daddy slept that time TC came and ask him to leave 2AC room and to shift 3AC.

They asked TC why this change and they are not gone leave bcs thay have given full fare of 2AC.
Then TC told no as per chart prepared your Journey Realloted in Lower Class.
And forcefully they have to leave the room.
This is very embarrassing.Bcs we have booked ticket 1 month ago.And suddenly this change.

Then he keeps saying them to ask for Refund. Bcs there is difference in amount which i have paid for 2AC then 3AC.

Kindly Check the attachment which TC gives me for travel information.And also this sudden chage.Bcs Normally Chages done from lower Class to Upper.

Please look into this matter.