KFC not adhering to CPA with regards to their vouchers.

KFC does not adhere to the CPA. Someone sent us a KFC voucher, which they bought. If you buy a voucher, you have to use the entire voucher in one purchase or you will not be able to use the rest. NOWHERE in the email with the voucher code is this stated, then when you complain they only refer you to their T&C's. However, it is not explicitly stated in their T&C's and if you look at the CPA, it is ******* to not give access to the remainder of the voucher, IF the voucher was paid for. I have sent them an email complaining about this and they have not attempted to contact me.