Hello AndreiD,
Thank you for your request.
In order to cancel the double purchase, please call us:
Tel. 0848 44 66 88
(CHF 0.08/min.)
(available 24/7, sometimes you may be required to wait)
or visit the SBB of your choice or use the contact form to request the cancellation of the double purchase.
Have a nice day,
Regards MelanieD