Worst service from FNB Credit Department

I have app**** a week ago for a credit card increase. The increase was approved with the credit application call center.They said the money will show 24 - 48 hrs. After that it had not show . A week later still not show. I call the credit department.According to the lady that assisted me it was approved and captured, but never processed. I fill in a complaint form online.A lady call me back and said it was unsuccessful. I also did the application on my Fnb app and it was approved..How does this work ?? This is the worst service I ever received from FNB. Please advise urgently. Please call me as I have the recordings.