I created this account before I ordered my landline contract. Now my contract has started. I am following guide on adding Telekom contract.  System asked landline number assigned to me, I gave it. It found my customer number, I proceeded. But at the last step, it gave me an error and told me to restart process.

When I tried to do the same again, this time it tells me to complete Telekom Login information. I think I am stuck in a state that can be solved by customer service manually. Can you help?