Please ensure that all characters are typed correctly without any spaces.
Please also ensure you enter any hyphens that may be included in your reference as well. These count as characters.
If you are still having difficulty, please ensure you have tried typing it by hand, as opposed to copying and pasting it from an e-voucher to avoid picking up unwanted characters inadvertently.
If you have verified all of the above, and are still having difficulty, please contact us for further assistance.