Incorrect Gross and Net calculation on my loan application

I am a bit worried about tge support I am getting from this bank that I grew to love. I app**** for a loan and it was declined furthermore I applealed after that they declined again recording wrong Gross and net. No one asked for my payslip and worse my salary gets paid to this bank. I wonder how they check things. I only have 2 accounts that I am paying for and they also noted I have many accounts with balance. One of the 2 accounts is their credit card. Can I get schooled how you do your calculations. I thought banking with Discovery will bring joy and now I regret leaving Nedbank.