In addition to the previous: is it technically possible to replace this trendy router with a “square” one without a table stand, because smart 4 does not fit into the wall-mounted connection box that I have in my apartment?

Hi,  Sven. 16:40?

Hi Timur!

Thats OK.

Yes I had technicians yesterday. They fixed the optic fibed cable connection as I understood. I was not able to check the connection, because my activation link was an outdated, and I received the new one just this morning.

Now everything works  fine,  connection is fast and stable so far. Thank you!

But I have few questions:

1. I received 2 service invoices 199 each. It is not duplication, they have different invoice numbers. Should pay for technican services? Actually I expected that I will simply connect my router to cable I will get my internet, as far as I Telecom declared availability of optic connection in my apartment. But By now I owe 400 euro :*-) 
2. In Telecom App now I have 2 contracts (or orders) : both unconfirmed. How to confirm them,  and which one?