Need to cancel online ticket booked wrongly

[hiya]

Hi. I bought  more tickets online by mistake today.

order no: 425748291, 425747708, 425747317

zurich HB->Grindelwald.

I need only 2 tickets. Mobile payment errors in the process. I want you to cancel one ticket. Please....

Thank you.

[NicolasK]

Hi @hiyaThank you for your request.

Unfortunately, I cannot cancel or change these tickets via this communication channel. Please contact our Ticketshop directly under the number +41 848 44 66 88 (option 2) or by mail (ticketshop@sbb.ch)  

Thank you for your understanding.

Best regards
NicolasK

[hiya]

I have one more favor.
One passenger name is jinhyung park, the other passenger name is seungwoo yi.
Please change name.