@Liefreldu98 Yes, unfortunately Blue Premium D, Fr and It have minimum contract periods of 6 months. Hopefully the contact to Swisscom with your explanations may help you to get out of this.
The contact form you may find here:
Contact form | Swisscom
here you can add files (word, pdf, etc in which you can explain your case)
Other contact channels you can also find here.
Contact - About us | Swisscom
I wish you good look.