Sorry mein Deutsch ist nicht gut so I will ask my question in English.

I am a new customer of the Internet service and had an appointment with Techniker this morning. I actually set everything correctly (e.g.Router, DSL cable etc.) and I can use the Internet to surf for days. But just now, the techniker came and said the APL from basement to my room is not okay and I should contact my landlord to fix the electrical line. But if it is broken, how can I managed to get the Internet these days? 

So, since the internet works, do I have to fix the line or something? Is there a possibility that Techniker open the wrong box in the basement? (Because mein Deutsch ist schlecht, sorry for that, and we didn't communicate well.)