FNB has not returned my refund for close to a month now

It has been almost a month since they debited my account, even though I had settled my loan amount. I have called the call center & sent an email out, my query has not been resolved. Does anyone else know how I can get the matter resolved, I am really running out of options & desperately need that money

If anyone can help me please email me on ********** Regards Reabetswe Mogatusi