config.inc.php username and passwords not being recognised

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I understand that the MySQL databases went down on Stoli in October. Since then we have had trouble with 2 pages that use these databases. We have been getting this error message sent:

Either the database username or password you have supplied in the config.inc.php file is incorrect
MySQL Error : Connection Error
Error Number : 1045 Access denied for user 'undying1_gb'@'10.33.248.81' (using password: YES)
Requested URI: http://www.yorkspiritualistcentre.co.uk/guestbook.php
Date : Tue, November 16, 2010 01:18:14
IP : 79.142.66.55
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Referer :
PHP Version : 5.2.13
OS : Linux
Server : Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_mono/2.6 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
Server Name : www.yorkspiritualistcentre.co.uk

But the username and password we have in the config.inc.php file are correct. What can we do now?
Thanks in advance,
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