Financial iregularity

Had two woolworth owm vouchers as woolworths financial services customer. When i tried to pay the answer was u can only use one. That restriction is not in any terms and conditions. When i challenged that the staff got rude! When i wanted to cancel the transaction i was told that cant be done. After having 40 min of my time....what was supposed to be bonding time with my daughter waisted i left the vouchers in store and walked out. Send customer service an email. And no reply!! Will close my credit card and shop elsewhere going forward. Woolworths has become expensive and arrogant!! Very disappointing.