Hello biplabphy
Sometimes it can take up to 15 days before the money is returned to your payment method. If you have received confirmation of your refund at the station, I recommend that you wait a few days and contact your bank.
Of course, you can always call the number suggested by @uebe for more information. If you call from abroad, you can use the following number: +41 51 225 78 00.
Regards,
Chiara_S
