revoking user but still can connect

[danialvht]

there is an issue to revoking a user. sometimes I use revoking function, user still can connect to server. there no sign of that user in any file and directory in openvpn on /etc/openvpn. any advice for removing them? it happens a lot of times.
in blow Screenshot see that there is 3 file exist on /root that name start with DATIS15...

and here on /ver/log/openvpn/status.log there is different old user are still connect to server.

and the most funny thing is there are no user in openvpn index file that use for revoking.

there is any way to revoke users are not exit any where but still can connect?