Since the German telecom has been calling our fax number and then disconnecting after 1 second for the last several weeks, I set up a re-routing in our Fritz!box router of calls originating from their number back to their own call center.
The calls continued, so today, I have blocked their number completely. Incompetence deserves such treatment and if they want to tell me something, they have my address and can write a letter.
Good for you!
You know how to react and block these kinds of annoyances – not everyone does