The Service Support Centre of operational services GmbH & Co. KG is the primary contact for the supplier. All requests, enquiries and problems are received there and, if necessary, forwarded as calls to the appropriate second-level facility. This then independently gets in touch with the supplier.
The telephone number can be found here:
List of other contacts
More detailed information can be obtained from the following e-mail address:
Description of the setup of the graphic web interface (German only) (385 kB)