Debit date change

i am deeply disappointed in the service i received recently from Capitec. their personnel failed to move a simple thing like changed a date for debit orders. i requested the date to be changed from 15th to end of the month. its now over 20 days and counting and about 50 harassing phone calls from the bank that i missed payment. i have resorted to paying it manually. I duly notified the bank timeously and went through the necessary checks and balances including approving the debit check mandate. come on Capitec how difficult can it be? i am told the calls are recorded and to date no recording has been made available despite requesting such. now my credit rating has been downgraded.