Fnb double debited my homeloan account

I am very disappointed with the level of service that I had received. My homeloan account was debited twice on the 24th and 25th of Jan 2021. Imagine during this time of the month with the pandemic that we are dealing with and after having to receive my last salary on the 15th of Dec and I am debited twice. I called on Monday spoke to a Lerato that advised me the same FNB that I bank with and have a home loan with can't see that amount has been debited and should wait for 24hrs this to be resolved. 24hrs later I call and speak to Christina who said now it will take 48hrs for the amount to be reversed back with just r4 in my account and no grocery I asked to speak to a manager to fast track the process she confirmed Sandie will give me a call. I asked for Sandler's surname or email address I was told she is not allowed to provide me with his email address I should however wait for his call...well I am still wait for the call and my R7500 to be refunded back. In the meantime I'm starting and while I wait for the people that got paid on the 20th to assist me.