Debit order

Very disappointed, I received an SMS earlier today stating that my debit order is deducted for my revolving credit loan. I immediately call the number on the sms and was transferred to 10+ people to assist me. one lady said they will refund the money to me as I haven't received my salary as yet. the next person said, oh sorry mam, we are deducting the money because of all the public holidays in December. Really, this doesn't make sense. I am not in that fortunate position to get paid early in December. I have been a client with Standard Bank for many years and have been paying my installments on time month after month. My debit orders is the 25th.But for some reason Standards bank has decided to take the installment early for their own convenience. this is not acceptable. i'm very disappointed in Standard Bank and its staff.