Debit order date change to the 15th of December

At the beginning of December, myself and numerous FNB customers received a very pecu**** SMS, advising me that my debit order will be deducted on the 15th of December and not at the end of December, and as per my contract the 1st of the Month. After numerous emails, telephone calls, I was informed by one of their highly educated staff that my debit order date is the 1st of the month, and also including the following comment: "the first day of the month which is the day after the last day of the month". So funny, as if I will not know when is the 1st day of the month. I requested confirmation of this statement on a Company Letterhead, and also received no response. I then went into overdraft on one of my accounts to make sure that I am not penalized on my credit record, if the debit order was indeed deducted on the 15th of December and the Debit order is returned. Wow, what a surprise myself, and also my husband received on the 15th of December that the Debit orders was deducted on the 15th. We only receive salary at the end of December and maybe if we are lucky on the 24th of December, in order for us to do some Christmas shopping. This is breach of Contract by First National Bank. I am also aware that I am not the only FNB customer with the same issue, as this issue was also raised on a few radio stations. This is so terrible. If I cannot make a payment, I am breaching our contract, however as a Financial institution they are allowed to do whatever they want. They are also the only bank that deducted debit orders on the 15th.