Credit card payment

I called standard bank to ask if I could pay my credit card and not use it the lady advised she couldn't do that. I then asked her to delink from m cheque account and put though a debit order, it was delinked but the debit order did not go though. I then phoned again to as for assistance for the same thing and I was told they cant do that s I asked them to transfer from my cheque to credit card, to date that is still not done. They are going to charge me interest even though I made means to pay this account. Is this how standard bank makes money? This is seriously not fair on the clients . I'm really annoyed