Hi, 
I'm trying to merge my account from https://breitband.telekom-dienste.de to https://account.idm.telekom.com/account-manager/contracts but has been proving a nightmare, neither of my account information is recognized by the system, such Benutzer or Festnetz.
As a beginner in German, I don't find any hotline in English to try to fix it.
How can I proceed in this case?