Your wristband code is the 14 digit code on the bottom row of the reverse of the wristband.
If you receive the error that the code you have input is not valid, make sure there aren't any spaces at the start or end of the code, and that you have the correct refund form - the event name will be at the top of the refund form.
If you continue to have issues with this, please email our team at support@eventgenius.co.uk and include a picture of your wristband code in the email.