McDonald's refund

I ordered food via the app from McDonald's save ways in Emalahleni on Saturday 2019/02/16. Not only was the food cold and late due to the restaurant changing to non delivery after my order was processed and no one thought to let me know until I called their helpless helpline, but the driver over charged me by R1450! He didn't provide me with a receipt and I tried to call after I received my bank notification to no avail. Thabang from the store then called me from the store to apologise and advised the money would be sent back to me asap. He then proceeded to WhatsApp me with his personal phone and I found that unsettling. I called the helpline again and requested to speak to a manager, they took long so I hung up. I received a call back from a gentleman named Tshepo who assured me that I would be refunded today and all they need is the last 4 digits on the card I used. I provided him with it and requested an email confirming this, I still have not received the email. Today I get a call from a cell phone from a rude lady who is now requesting my bank account number. I tried to explain to her that I can't just provide her with that information as I'm not even sure she's from McDonald's and I had provided them with information Tshepo required.

I honestly just want my money back and I would appreciate a cash cheque or cash as I'm currently recovering from a major surgery and don't need stress from your rude staff

Regards Refilwe Matona