Wasting my valuable time

We have an existing Vehicle Asset account with Standard Bank, this account expires September 2019. This account is paid from Standard Bank to Standard Bank via EFT as requested by the 7th of the month. Yes we have had difficult months where we are unable to pay by that date, but we still pay the bill. For approximately the last four months Standard Bank will phone to find out if we have paid and they will ask a whole lot of questions, which is time consuming and unnecessary. We have paid and that's it, stop harassing us!