INCORRECTLY DEBITED

I have previously taken a loan with Capitec and subsequently paid it off within 5 months. I decided to take another loan and requested that they debit my account on the 28th or 01st of every month and they advised me that its impossible to do so as my salary date states the 25th of the month. But just as of today i saw an sms from my FNB cheque account reflecting that Capitec has debited R3359.00 from my account and this has now left my account in overdraft, which i will be liable to pay interest for every day that passes in overdraft. I called the call centre and spoke to Shaylin who gave me reference number ***6 and she transfered me to Nomsa who said she couldnt help me and then cut the call. I called again and spoke to xolile who advised that Capitec doesnt know when people are being paid so they debit the account so they can get their money before people spend it and that i should go to the branch with my bank statement showing that i havent been paid. That is breach of contract since my contract states the 25th and no one called me or sent me an sms stating what was going to take place. I am absolutely disgusted at Capitec. I plan on taking this up with the ombudsman