Bad customer service experience

On the 20th of December I went to Jet stores to make a purchase, when I paid for my goods they experienced technical issues with their machines, the receipt did not print out and the funds were deducted from my account. they promised me that I will receive my refund within 24 hrs up until then I am still awaiting my refund, doing daily enquiries and not getting positive feedback nor solutions all they can say is that its been escalated to head office and we awaiting feedback but no response or resolutions are being provided here. I have provided you with proof that I have not received refund three weeks ago and still no refund!!!! I am truly disappointed with the service and would like my refund to be done urgently.