I've not been reimbursed

Horrible service! Cashier accidentally cancelled my transaction on their software system, the cost of the purchase was approved on their payment device and the transaction SMS was received - the cashier refused to provide the items purchased and refused to refund the payment made - 20 mins of my and my family's time wasted - the slip indicates that the cashier cancelled the transaction after the payment was received - I was instructed to wait for their head office to reimburse me, no 1 has contacted me and no reimbur*****t was made - the cashier refused to show any accountability or empathy for any error made or inconvenience caused