where did you get the funds on that exchange? Is it from Airdrop or from any "free" promotion?
If yes, @mocacinno have right, it is a scam.
If you check his domain name, whois protected and only 129 days old:
Dates 129 days old
Created on 2019-09-29
Expires on 2020-09-29
Updated on 0000-12-31
Name Servers JOCELYN.NS.CLOUDFLARE.COM (has 22,110,068 domains)
OWEN.NS.CLOUDFLARE.COM (has 22,110,068 domains)
Tech Contact WhoisGuard Protected
WhoisGuard, Inc.
P.O. Box 0823-03411,
Panama, Panama, pa
If you do some more researches, you will find
https://bitcointalk.org/index.php?topic=5215689.0 where we already talked about this way of scam.