Late debit order deductions

I don't know why Tracker fails to debit on the 23rd of every month as I requested from my initial application. It's always days after that they decide to debit and when there is no money in the account they always keep sending smses about the failed transaction and that a manual payment must be made. I am not going to make a manual deposit because they failed to debit on the day they were supposed to. Who is to blame??? And then they will want to suspend my acc for non-payment... Why must I suffer if Tracker fails to debit as instructed? And then they have the nerve to double debit the next month as if the increase itself was not bad enough. Please make sure that you debit on the23rd of every month PLEASE. I am tired of playing this game really. It's really is a simple request. On the 23rd...23rd...23rd of EVERY month then there will be no failed transactions and everyone is happy. Simple as that.