Dear BoSch
Thank you for your comment. I am sorry that you are not satisfied with the SBB services.
There is indeed a GA travel card valid for one month, see, https://www.sbb.ch/en/travelcards-and-tickets/railpasses/ga/ga-1-month.html
It seems to me that you have bought a yearly GA, which can only be cancelled for the first time after six month.
Kindly note that this platform is not an official SBB support channel; we cannot assist you with the cancellation of your GA.I suggest you contact the SBB Contact Center.
https://www.sbb.ch/en/help-and-contact.html
Best,
Roland