Hello Chiquizigh33
Firstly, welcome to the SBB Community, and Happy New Year.
Please contact an agent at any station’s ticket office, or call SBB: 0848 44 66 88 (CHF 0.08/min, waiting times are possible), or use the SwissPass chat for Half Fare Card customers (at the very bottom of this page):
https://www.sbb.ch/de/hilfe-und-kontakt/produkte-services/swisspass.html#anchor4
Kind regards,
Roland