No refund, for a transaction I was double billed

I went to Mr Price Home Northgate on the 27th of January 2018, swiped R2539,94 for my items and I was charged twice for the same amount - same items. The teller assured me that the extra charged money will be reversed to my account automatically on the same day, but it didn't. I went to the same Mr Price Home branch on the 28th of January 2018, to follow up on the matter after my money was not reversed, I was told that the store will sort it out the next day, I was also requested to bring my bank account statement. On the 31st of January, I took my account statement to the store, and the store called their cash book department, who checked and confirmed that indeed the shop double charged me, they then promised to reverse the money and it should reflect the next day - on the 1st of Feb. Today is the 8th of February and my money is still not paid back by Mr Price Home. I've been intermittently going to the store, and calling the store every day to follow up on this issue, but they are yet to pay me back. It's an inconvenience for me and a financial set back, also frustrating that they made a mistake but they take long to fix it, while I suffer the financial setback.