CNA voucher system offline almost all the time.

Bought a few vouchers a while back to make some purchases at later stage.

After an hour in the store getting a few gifts and stationary and headed over tk the tillpoint. Voucher system was offline. Couldn't complete my transaction.

Manager was kind enough to hold all my goods in her office so I can come back some other time to come and collect the goods.

Why have sell vouchers when the system is offline most of the time. This is not my first experience.