I understand that, but its the way they just did it without warning and without any option to correct. My mistake is simple 1 number wrong in my date of birth, I must have missed the correct key, yes my fault. However, they refuse to correct it so I can pass KYC. That is wrong!
There is something called "investigation", if they were honest then they could have investigated the case instead of blocking a user account at the first place.
It's most likely every exchange has user's IP, email id record and these can be used to investigate and identify the real user and then they could have allowed you for KYC.
But their answer "Sorry at the moment we don't cater User's updating their information." doesn't prove they are professional and trustworthy.
I hope you haven't lost much there.
Let your INSN community know about the issue and warn them, post it in discord and TG.