Irritated customer

On Friday I sent my husband to buy a Zinger burger of R39,90 the cashier put in the incorrect amount of R390,90 so that amount has been deducted from my banking account, my husband then realized the mistake and went back and this is part that has got me frustrated as I now am, the Manager of the store Marura S did not know how to do a reversal and could not contact the head office as they were closed and told us to come back on Monday. Monday comes and we go back and now they want a bank statement showing that the money was deducted from my account, I show them on my banking app on my phone that the money has been deducted but that’s not good enough bearing in mind that this is KFC in Mitchells plain and I’m from the Northern Suburbs so I had to drive all the way back only to find out they can not do it without the bank statement. The banks are closed by the time I get from work so how am I going to get my refund??? Highly irritated the Manager gives me the number of the area manager who was a bit more helpful but firstly why did he not call the area manager as that was his job, he gives me the number so now this is my problem to solve, he now doesn’t want to do what he gets paid to do. Still no refund and waiting for answers from area manager