confused a lot about ackermans account

I'm writing this with a lot of confusion. I app**** for ackermans account last week online and i got this sms (Mrs Mlangeni , your Ackermans application is provisionally approved with a Credit Limit of R7,500.00. Activation subject to your latest 3 mnths payslips/bank stmnts & ID in store OR fax it to *** OR email to *** OR Upload: https://t2m.io/im5ntyP (Link expire 2019-07-11 09:43:20), T&Cs https://bit.ly/2R6jCCA). I did send the bank statement the following day. today after 3 days I got this sms again from them (Dear Mrs Mlangeni, unfortunately your Ackermans account will be closed due to your proof of income not meeting our minimum requirements. ***). I'm really confused as when I called them after receiving this sms, they said my gross salary is not the same as the one appearing on my bank statement. I'm confused as in my bank statement, gross income won't appear as it appears in my payslip. the income that is appearing on my bank statement is my net salary not gross and I would like to inquire about how can my gross income appear on my bank statement.