Impossible to change debit order date

I went to Goodwood branch today to change the debit order date my credit card goes off. The consultant tells me that this is not possible. So meaning I get paid on a later date now my debit order will bounce due to capitec's negligence. How can this be impossible. I would really like a good explanation as I feel this falls under bad service. As where I could go to another bank and they would gladly change my deduction date for me. So now my credit record gets affected and capitec could not care less.