Useless banker

So let me begin. my debit order date is the 21st of every month. i got a new job and because i resigned i will get paid on the 31st (on the last working day of the notice month). i am a private client (paying a fee for a private banker) and notified him (Sibusiso Mbatha) of the changes and asked him to move my personal loan and vehicle debit order date from the 21st to the 31st (or last working day of the month) due to the fact that my salary will only be paid in on the last working day. so all of a sudden i get calls from MFC that my account is in areas with 5K for May (but my instalment was paid in April) and they want to debit me the 31st of may for the arears amount and then on the 1st of June again for the instalment. HOW IS THAT POSIBLE THAT MY ACCOUNT IS IN AREARS IF THE INSTALMENT GOES OFF EVERY MONTH ON THE 21ST??? AND ON ONE MONTH JUST ON A DIFFRENT DAY??? And i am sure there will be issues with my insurance (with Nedbank as well) and the personal loan. Sad that i pay for this service to have a private banker but as useless as can come!!