I found this link https://dsl-retoure.o2online.de/start/Dashboard/Index for (as far as I understand) returning a DLS router.
I have "Seriennummer" as this is written on the router, but the portal asks for "Festnetz-Hauptrufnummer" and for "o2 Kundennummer" but none of those are in my contract / router / papers. They aren't in any email (I have read all of them) and I'm unable to send anything without those.
.. I tried to call also the hotline, but it keep asking me for some number as well and nothing works as I don't have this number.
.. I also tried to register on this website as a customer, but the registration also requires some kind of numbers I don't have, nor they are in my contract.
How can I resolve this, please? I'm lost already for several months.
Lösung von o2_Giulia
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