DEBIT ORDER BEEN TAKEN ON INCORRECT DATE

hi there- so my credit rating is bad due the staff at your company not doing what they are suppose to do- I checked my bank statement today, only to find that TELKOM has been debiting me every month from APRIL already on the 15th and again on the 25th- the agreement I had was that my debit order be taken on the 25th, reason my pay date is the 20th, NOT 15th, the consultant that assisted me in Kenilworth cape town advised they only do debit orders 15th, 25th and 31st- as my pay date is the 20th I advised my debit should ran the 25th-PLEASE TELL ME WHY YOU PEOPLE DEBITING ME THE 15TH AND AGAIN THE 25TH!!!!! I wanted to apply for a loan was decline due to insufficient funds in my account and payment that reversed. get some1 to call me back immediately as your call center cant do that as I've been calling whole day, and when I ask some1 to call back, all they say is YES SURE.... I want this changed and confirmation sent to me. this is madness!!! your agents want to transfer me back and fort cant assist, *** is that. debit need to be the 25th ONLY!