Over Deduction

I'm aware of an account payment that was missed the 25th June, for which I take full responsibility, my complaint is regarding the following, on the 15th of July another debit order attempt was made to my account, on this debit order attempt, not only did Telkom deduct the June amount but also deducted the month of July, which I do not agree with, as the July amount was only due for the 25th of the month as per signed agreement. There were no communications sent to me concerning the second debit attempt, therefore I could not have possibly known to make preparation for this deduction, on top of this my account was levied with an additional R200 for the month of August, I received a SMS stating my next invoice will be an amount of R1460,70, with no explanation why I am paying R200 more.