Transferring website to other host

Hello,

We transferred our domain and website to another hosting provider one week ago.

The website will not function and when we try to open the admin we get this message;

Error Establishing a database connection

This either means that the username and password information in your wp-config.php file is incorrect or that contact with the database server at md49.wedos.net could not be established. This could mean your host’s database server is down.

And our domain and hosting is still listed on the wedos dashboard?

Any help is much appreciated.