Dear Sir / Madam,
I apologize for writing in English since I cannot do it in German.  Today I received a SMS indicating a technician will come to my apartment on November 12th, 2024. I accepted the appointment, but then I saw that this appointment is related to connecting landline internet. However I already have a mobile connection (Speedbox 2 modem with a simcard).

I tried to cancel the appointment but after entering postal code it showed that postal code is incorrect; and after 3 tries cancellation process got blocked. I have not ordered any landline internet connection in last few months. I would like to cancel this appointment.

Thanks in advance!

Ali