Credit Card poor service

It is really difficult to deal with FNB. Every time you need service you need to log a complaint first before you can be assisted. I increase my credit card limit on Friday, I received a message to accept DO mandate which I did, and I receive a confirmation quote but until now I have not been responded to. I tried calling the contact center, I had to wait for long minutes no one picks up, I tried the App chat and I was sent from pillar to post with no solution. Can some please attend to this.