can't login anymore

Can't login anymore.

My personal Norton firewall alows smartftp to open.

This is the message I get:
SmartFTP v2.0.1000.3
[00:34:32] Resolving host name "ftp.100megs28.com"
[00:34:32] Connecting to 205.214.86.21 Port: 21
[00:34:33] Connected to ftp.100megs28.com.
[00:34:33] 220---------- Welcome to Pure-FTPd [TLS] ----------
[00:34:33] 220-You are user number 1 of 50 allowed.
[00:34:33] 220-Local time is now 16:34. Server port: 21.
[00:34:33] 220 You will be disconnected after 15 minutes of inactivity.
[00:34:33] USER ddeclerck@vkengine.100megs28.com
[00:34:33] 331 User ddeclerck@vkengine.100megs28.com OK. Password required
[00:34:33] PASS (hidden)
[00:34:33] 530 Authentication failed, sorry
[00:34:33] Active Help: https://www.smartftp.com/support/kb/51
[00:34:33] Cannot login waiting to retry (30s)...


Probably our administrator 'tmonteynek@vkengine.100megs28.com' changed our password before he got sucked out of the office.
By doing that he blocked all access to the ftp-server.

How can we get access again?

Please help

You must mail your hosting for that, we can't help you more.