What is wrong with you guys

Standard bank service is deteriorating every month before my VAF can be debited I have to call in ask them 2 or three days after the agreed debit order date, last month they failed to debit again and when I called in I was told that the system is malfunctioning and was requested to do a manual payment which I did, 02 days later my account was debited for the same amount that I paid in manually my year end plans ruined.This month fortunately the account was debited without any hustle on the agreed date, but to my surprise my VAF installment was paid back into my account.I am really tired of having to call standard bank every month just to ask people to do their job, NB There is always sufficient funds in my account for all my debit orders