DEBT COUNCELLORS/FNB KEEPING YOU IN THE GROUNG

So I have been going back and forth from Hyphen PDA to FNB with regards to me being charged interest before my debit order had even gone off. I seriously cannot understand how they want to say there is nothing they can do about the interest as "this is as [er my agreement" which is utter nonsense. If this was my agreement hey no problem however my instruction was to debit me on the 26th of every month and then Hyphen PDA only debits me on the 27th and only after that they allocate the payment latest by the 9th of the following month. Now how the ****** hell must I be liable as this is clearly not my agreement. To top it off the statements I received does not even show that any money is outstanding besides the supposed interest. Besides all this, if my final statement in April showed a debit payment of R 96 odd rand for the may month and the debt Councillor says it is a mistake how can they the want to come to a person 2 months later and say it was incorrect on the statement but it is actually almost 6k that is outstanding.?? Somewhere along the line some is bull sing someone but it is not going to be me. Either someone at FNB or Hyphen PDA has not done their job and funny enough the debt Councillor does NOT reply to any of my emails or calls. To me it smells like something fishy. How is one supposed to #WIN with these people????