Failure to comply with payment arrangements

Standard bank has been debiting my Fnb account for my monthly home loan instalments prior or later than the agreed upon dates, therefore inconveniencing me having to make a deposit at a standard bank branch when a signed agreement is already in place,<br> an arrears amount reflecting on my account was arranged (in writing) to be debited by standard bank from my Fnb account on the 01/09/2015 which has till date not been done, I have contacted the home loans dept. who tell me I need to make more that the arrears amount in payment to change my payment date and bring account up to date and the Credit manager Mathivha, Mpho has not responded to my email correspondence dated 04/09/2015, to top this off, we are inundated with calls from the standard bank call centre informing us that we have not honoured our commitment to make payment.