Woolworths does not want to refund me my money

on 06 March 2020 I have made a payment of R500 at woolworths store in centurion, the cashier allocated the payment to the wrong account the account that is long closed. when I call the head office they have said they will re-allocated to the correct account. the following week I have checked again nothing was done, I had to call them again, they said I must email them a proof of payment, I did that, I did follow-ups several times by emails and phone calls using my cell phone to date nothing has happened. when I am on areas they are quick to call me even at night. but when they own us it take more than 3 months before you can be assisted

I want that money with interest of 100% per month. now we are at home I need to use the money for my children, I cant because Woolworths is in control of my money.

Please assist Peter