Declined product upgrade

Good day<br> I have been trying to upgrade my Gold discovery card to a Platinum Card but to no success. I keep getting told it is due to my affordability and that I cannot afford the product. I have submitted documents proving I receive a extra rent income and still no success. The fee per month is R20 extra, I most definitely can afford the product.<br> <br> The only reason why I want to upgrade is due to the miles cap that has been implemented. I am maximizing my 5000 mile cap currently on my Gold card. I do not want a bigger credit limit, it can stay inline with what I currently have on my gold card. <br> Between my husband and I we have 4 out of 5 products that discovery offer, we are discovery partners all the way but with this I feel that our business is not appreciated. <br> Please will someone condiser my request and get back to me.<br> <br> Many Thanks<br> Erica