Unfair charges and my refund

I mistakenly paid some money on my old credit card around beginning August, went to the bank to report so they can refund me because the credit card is old and closed but don’t know how it’s linked to my FNB app, they told me it will be paid within 7 working days and it has been more than that, I can’t get assistance when I try to call I never get through am always sent from one department to the other. Can I just get my money back please. Also FNB has so charges on my aspire account that don’t make sense. That also no one can explain what is happening... the current state of our country and with banks wanting to chow the money that we already don’t have is not make sure. Am complaining on this platform cause maybe I will get help