Not every client logs into their account on KuCoin on a daily basis. Most will likely go to the website once in a while, unless there is an email sent out about a recent change.
I think I made it clear that no email was sent!
Okay my bad. I thought you said email was sent. Well I think I receive delisting emails from exchanges. I am with a lot of them but not sure which one's give away.
If they have not sent any email then of-course there is a lack here from them. Try to talk to them and point it out that in your case it was not easy to visit their site every now and then to check updates and you completely missed it. Give them the link of this topic too. May be it will help.
Good luck.