Unhappy about the system

I have 2 loans with this bank & they both debit on the 23rd & I called in to request them to debit on the 29th this month only, due to my employer paying me on that date this month & the consultant says they can't change it. Of which I'm finding it unfair cause I'm calling early in the month just to avoid any complications & me having to pay for an unpaid debited order . how is that fair to me as a customer whilst I'm taking full responsibility I'm placing a notice early? & why am I not given that freedom to control my payments? Its not like I'm keeping quiet & not paying or something. Please do something about your system cause we are not happy. So this means I must pay for my bank charges whilst this could be prevented early? I'm really unhappy.