If you are not able to resolve your query from these manual pages and the portal self-service functionalities, you can contact TDS support via email:
Emails are automatically processed as issues/tickets or comments/replies to your existing issues.
Anyone who contacts TDS support for the very first time will also get an account created automatically in TDS Help Center:
Later you can reset his credentials and log in to the support portal. Support portal gives you the possibility to see an overview of your previously and currently open tickets. You can also report new tickets using that portal.