FNB premier slow response

I recently contacted per telephone call the team of premier bankers at FNB to assist me with changing my account type and the person said, just before the end of the conversation, that a person at the relevant department would contact me in 24 to 48 hours. They have not called me yet in 2 days.

I went on to chatting in the FNB app with the team of premier bankers and the person also said someone will contact me to get the ball rolling in about 24 to 48 hours and I pleaded that the previous person also said this and no one has called me yet. I left it at that and now 2 days later no one has called me yet again to assist.

So this is now 4 days that I am waiting for a service that I am paying quite a lot for and when I use it once in a blue moon, the response is very slow and I need to come and write a review here to get a response.

So please can anyone assist me with this?

Thank you.