Refund and poor service from staff and Manager Sarah Nketsi

I purchased 200gb data from cell c on the 19th April 2022 using my bank card. A few days went by and the data was not loaded. I called cell c to check why the data was not loaded and they said because the money did not reflect yet. Then on Friday the 22nd April I purchased another 200gb the same way with the bank card which then the data was loaded a few mins later. I called them again for a refund for the first purchase and they still gave me the run around.

I went to my bank to request that they refund me and they gave me a dispute form to fill in and also supply proof that I tried to communicate to get a refund from cell c.

I then called cell c and spoke to Patricia who didn't give her last name and told me that I should leave my details and the manager will call me back after she went to the back office. I asked her to put the manager on the phone since she was standing next to her and the Manager Sarah Nketsi refused to speak to me. This is the 3rd time this week trying to resolve this matter. It's been 7days since I lodged this complaint and I'm not getting anywhere. I need my refund so that I can pay my rent.