Debit Order done on the wrong date

I have an revolving loan with standard bank, debit order was set to 23rd of every month, after the January debit I called their call centre to change my debit order date to the 5th of every month, next debit for Feb was going to take place on the 5th of March as per my agreement with the call centre agent, now to my surprise I wake up this morning the money I had on my account is gone and I did not get a notification for it, when I check on my banking app I see that they debited again for January.

When I phone the call centre they tell me they cannot reverse because its standard bank, I asked to speak to the manager and she tell me I must call after 24 hours for them to check if it reflects on their statement but I can see it on my statement,

I'm really ****ed off as I don't even have money for my kids transport and for my petrol . I thought standard bank was the best bank but today they proved me wrong, I want nothing to do with them, I just want my money so that I can take it and keep it safe on another bank.

You think you have money whereas I took it already, nxaaaaaa!