Very Poor customer service and inconveniencing issue

I went to buy food (All star box) I paid at the self-service machine, however, it did not give me the order number, i swiped twice because the machine kept saying Decline but the money was deducted from my account, i showed the manager and all I got is its, not their fault I should wait for a refund, i have never been inconvenienced like that and disappointed and frustrated. because the money went out twice from my account.