standard bank fails to comply

I called standard bank in september 2015 to notify them that i will be getting paid monthly as my training is complete , my request was simple that they must move my deduction from WEEKLY to MONTHLY , i spoke to managers which promised it will be done , now im in the month of OCTBER but still getting billed WEEKLY even when i reported in SEPTEMBER that i will be on MONTHLY, Now i can pay my account the problem is its on weekly , how useless is the service i got from this Big instution , im very disapointed . im being charged bank charges for weekly amount that i said must be monthly long ago ...1