Hello Ckalietoick94
Did you really buy this ticket on sbb.ch? If you received a mail from the DB, why do you need a second one from the SBB?
Usually, in such cases, you can take every train in Germany, it means that you have no more train bindings if you have a Saver or Supersaver Ticket. Is it mentioned in this mail?
You can search alternative connections on bahn.de, but I think that it will be no more possible to travel with a direct train. The night train starts from Köln Hbf and it is not mentionned that cars with seats are available.
You can call the SBB Contact Center with this number:
+41 51 225 78 56 (24/7, waiting times may occur).
Kind Regards
Danhiel