Worst bank ever

I took out a loan with Capitec bank in June and what a mistake that was. They a setting up debit order dates that are before my day which adds interest and will affect my ITC profile as I will be seen as a late payer. I don't understand this as my salary gets paid into Capitec and never once have I gotten paid on the 21st of the month. Then when I emailed customer service they want me to send documents to prove my pay date which is an inconvenience. Number 1 I bank with you so you should see a trend as to when my salary gets paid in. No 2 my payslip will not have my pay date and no 3 getting a letter from my work with a letter head just to show my date is something I don't have time to do. All I asked was to check when my salary gets deposited and adjust the date accordingly you cannot be making your own dates and then charge my interest. If this isn't dealt with I will be taking it further