unresolved complaint (standard bank bad service)

My name is Mpho Malahlela I have a vehicle account with Standard bank, November 2019 a consultant changed my debit date from the 15th to month end without my consent and suddenly everything went wrong on my account. I asked them to return me to my original debit date and now my monthly instalment has increased. I have logged a complaint with standard bank January 2020, my complaint was handled by Mr Colin Kriel, I also attached the CEO Lungisa Fuzile and to date my complaint has not been resolved, the worst part is my emails are ignored. Standard bank is offering bad service to their clients, There are only consent about our monies and not us.