*******ed click!!!!

I'm not very impressed! You send me 2 x R12.40 voucher then Centurion Click tells me i can't use it???? Why can't i use it!?!?! IT IS VALID UNLIT NEXT YEAR !!!! I'm not impressed by the way i was treated as well ! Why do you send out vouchers if you are going to change the system !!! I demand a refund on the vouchers !!!! Or else what is the useless point of having a rewards card if you ***** the cash back !!! *******ed click!!!!