Refund not processed as promised

My payment date for wonga to debit my account was on the 23rd of April 2019 however on the 19th of April i settled my loan. 23rd the debited my account and i called immediately to ask for a refund. The lady i spoke to assurred me that it will be in on the 24th and actually its in as we speak just that my bank has to approve it. My debit orders runs every month on the 25th and today my money my refund is stil not in. I called and spokr to Benita who could not give me her lastname she told me i should wait 24hrs and asked to speak to het team leader and het said hr is busy on another cal and wil cal me back. And de leader never called. I have a telkom debit order and if it failes i would b charged penalty fee of R200.00 now wonga should pay that not me. I tried to disput the debit order on my bank app but could not . Had the lady not assured me that it would be in on de 24th i would have gone to the bank and reversed it.