Debit order amount increased with no prior notification.

My debit order amount was increased without prior notification and when I query this all I am told is "apologies we sent emails to all our clients". And also my statement was sent very late after the debit had gone through which is not right, the statement should be sent before the debit. Well, I did not receive this notification and requested over Facebook that I am sent the notification and I was told it is not possible. I even went to the Mall of Africa MTN and they told me to just accept it and live with the fact that my debit order amount has been increased. As a customer I deserver to be notified of an increase in my contract as in our initial agreement I am to pay R299 and if this changes I should be notified well in time. KM Mogaleamalla *** 5003 Maduna Avenue P****long Tembisa 1632