Credit limit increase declined due to affordability, but I have an excess of R4000 per month to pay and then I have an excellent credit record

I am very disappointed, as my Credit limit increase was declined due to affordability, which doesn't make sense to me, as I have a surplus of R4000 per month to pay and then I have an excellent credit bureau record. My bond on my credit bureau record is paid by my husband and shouldn't be added as an expense and the FNB credit card on my credit bureau is paid up and closed in 2017 already, so it shouldn't be included as an expense either. I don't want to go to other banks - I want to support Absa and would appreciate if they could relook at my application urgently please.