Conflicting Information, Untrustworthly Bank

I would strongly suggest that no one does any sort of banking with Standard Bank especially not a home loan. This is not the first problem I have had with Standard Bank. Last week Friday I called to confirm our first home loan installment amount and when it will be going off. The amount was confirmed by the agent. On Monday no debit order was deducted and i was contact on thereafter to tell me that the bond is still reflecting as a building loan. Today I receive an SMS stating our home loan is in arrears with amount due. Only to discover that Standard Bank did not initiate the amount and changed the due date to the 28 June. We have no problem paying the bond amount but when they wanted to deduct the amount was now higher. Which is different to the SMS amount I received today. How is this possible? I will only pay the amount that I was given on Friday which is the same the SMS received. The rest of the funds Standard Bank can write-off. We were responsible enough to confirm the amounts before-hand and now all of a sudden it has changed and nobody can tell me why!