Clicks failed to refund my money back

On the 28th of July 2020 I was buying few items at Clicks in Canal walk so happens that the cashier charges me twice. I went back to the store and spoke to one of the managers that promised to call me back on how they gonna refund my money back and the manager didn't phone me back and after 3 days I went back to the store and dealt with a different manager that was not aware about the incident a I had to leave my details with them again which showed that the managers in that store do not communicate to each other with regards of what is happening on a daily basis in the store so the 3rg manager also did not contact me they told me to call my bank which I did not understand because it's normally a store that phones the bank and they give authorization to the bank for them to reverse the money. I phoned my bank and they told me the very same thing that the store my phone. Imagine buying goods and ask your bank to reverse the money isn't that ***** (i was asking myself that question). I went back to the store and explained everything but they were clueless with the procedure and Clicks faild to assist me not knowing whether I will get my money back.