Credit Card increase taking too long

I have requested a increase on my credit card a week ago, it was declined which cant be because when i app**** for it the first time I was offered R15000 but I only took R5000. I also pay in much more month than I have to. They never contact me back with feedback and every time I contact them they have a new excuse why the process is being prolonged for example they need my payslip.I even asked if they have feedback this morning via e-mail, still have no reply and had to call them. The issue should have been resolved in this week but now I have to wait until next week again because of poor communication. I want the issue resolved today but I keep being told the same thing over and over, I have to wait 3-4 working days