Still no refund for double charges

My mother went to CNA Southgate on the 12th January 2019. Her debit card was swiped after which the sales attended (Barbara) told her that the payment was declined and should swipe the card again. Payment was approved after the 2nd swipe, however my mother received an sms that both payments were successful and charged from her account, Barbara the sales attended was notified immediately but however insisted that the amount will be reversed.

On the 14 January 2019 my mother called CNA Southgate to notify them that the payment had not been reversed. She spoke to Patricia who promised that a complaint was lodge and takes 48 hours to resolve and refund.

Today is the 18th January 2019, no follow up from either Patricia or Barbara regarding the matter.

Today i called the head office and was told they had no records of the compliant as the store did not lodge it with them. They lodged a complaint which "takes 48 hours" to resolve.

My mother has been waiting to be refunded for an entire week to no avail. If the money was deducted from her account within less than minutes (not 48 hours) surely CNA can refund her without any hassles.