A simple request you complicate : debit order date change

I am beyond frustrated with your not so flexible process, called your call centre so many times and could not get any assistance. My request is simple I need to update my debit order date to 28th this month January as I'm getting paid on this date, I have changed jobs, started my new role with Quest Agency in December 2021 therefore I have received two payments from Quest so far but your call centre guys mentions you require 3 months bank statement when I bank with you and have just mentioned I started a new job

Quest Staffing have mentioned that they do not issue out a letter confirming date of payment as salary date is not fixed and changes from month to month. I need you guys to update my debit order date then receive your payment because if you don't this will bounce for the 25th. I can't believe this