Pay money for bad service

I have requested my debit order to be moved since I got a new job and get paid on a different date. I sent email to various people and not even one of your employees who I sent the email to had the desancy to respond. So why do I have to pay for service that doesn't even exist. I will cancel my debit order with my bank and when you don't receive any payment from me it will be your fault since I asked nicely for debit order to be changed to another date. Also note that if this issue is not resolved by the end of business today I will cancel my medical aid with you and go to someone who is more than willing to help out their clients.