Terrible callcentre customer experience

Standard bank callcentres are truly the worst! I've had so many bad experiences with it that its eventually led me here. I was called a few months back with an offer to increase my credit limit which I agreed to and was told it would take 24 to 48 hours to reflect and then, nothing, nothing at all. I called and called and to this day had still not received any feedback. Same thing happened again when they called me to upgrade my card to a platinum card and then, nothing, I called back and they said someone would call me with updates, its been about a year and still nothing. I then decided a few days ago that I would try them again and give them the benefit of the doubt. I reached out to the callcentre to increase my limit, I was then told it needs to go through to their credit department but they will call me back. Lo and behold, no callback. I called in yesterday and the agent said he would get the agent who did the application to call me back before 6pm last night and of course, nothing. I called a few mins ago and a lady who sounded like she had no interest in listening to me, put me on hold for a very long time until I eventually had to hang up as my airtime was running out. I have been to a bank on a number of occasions and I have always had a very positive experience but the callcentre staff are truly ********** and really do not give a damn about proper customer service!