Capitec not delivering on service and shortchaining the client

For more than a year, actually close to 2 years, I've tried to change the 'due date' on my loan repayment - from the 26th of each month, on which the bank insists, to the end of the month when my salary pays into my bank account, to no avail. The only comment I do get is the constant 'threat' that it will influence my credit score. As soon as my salary does pay into the account, the amount is deducted faster than lightning! Except for the covid-19 reprive, not one payment was missed/skipped. Fighting an endless battle getting nowhere against the Goliath. All I want is to have the flexibility to choose the date when the amount should be deducted - why not give the client the option to choose the date? Why should I be forced to make a decision based on a system that is flawed - the data in a system/computer is only as good as the data 'fed into' it - garbage in, garbage out - GIGO!!