What is a justification letter and who's requesting it? If you are talking about a PFL, you probably shouldn't attempt to do it yourself.
Yes they are saying
“Specifically, I have concerns that you may be inadmissible for misrepresentation. The educationaldocuments from Gujral Punjab Technical University that you submitted in support of your application were verified and confirmed to be adverse”
But my university name was I.K.Gujral Punjab Technical University formely known as Punjab Technical University.
In some of my DMC it’s written PTU and some IKGPTU
So what to do now? They have given me 10 days time to respond. And my educational certificates are legit