@datcal There should be no reason of not beeing able to place a service call. You might try it online:

https://www.telekom.de/hilfe/hilfe-bei-stoerungen?samChecked=true 

https://www.telekom.de/hilfe/hilfe-bei-stoerungen/leitungspruefung?execution268328=e3s1 

But may also wait for someone from the T-Team to give you a ring. As I have notices, you already entered some contakt infos into your profile...........

Thanks for the pleasant call. As discussed a technician will come tomorrow (25.06.2025) between 10 and 14 o'clock. I will keep my fingers crossed that the issue will be solved fast. Drop me a line if I can do anything else for you. Kind regards, ^Martin