Standard bank callls has made me feel harrassed

I have an account with standard bank vehicle and asset finance since 2013, till this day. Initially i requested them to debit on the 25th but they didnt approve and approved the 23rd of which is my pay day. It happened that the 23rd fell on sundays in few months continuously making the 21st a payday. So i have been called every day on the 22nd following up on the payment. You will swear i dont have other accounts with them. They wont even make changes to it they say its the system that changed it yet they call me. I feel harrassed for being called on every 22nd for payment as if I've skipped some payments or owe them for months. I'm very tired of it and im considering changing the bank and move all my accounts i have with them. I have to repeat the same thing to every consultant that calls every month. Why cant they check my cheque account if there was money received before calling me. I get paid using the same bank.