Try calling a phone number for a different country.
The Swedish number is a free one, you don't even need credit on your prepaid sim to call it, but it's only reachable using a Swedish phone.
When calling a number in a different country your phone operator probably charges you an additional fee.
Translation of the German Allgemeine Beförderungsbedingungen (using DeepL, emphasis mine):
§ 8 Exemption from the obligation to carry
Events of force majeure such as weather conditions, strikes, lock-outs, operational disruptions or unforeseeable circumstances which may impair the safety of the transport operation shall postpone the ...