Bad service delivery

I've logged ***** cases early June with FNB. It is now near end of July and I still have not received any feedback from FNB. Not even a call to tell me the outcome. I've tried to call myself but I am on hold for more than 30 mins before I eventually give up and end the call. Always the same "high call volumes" story on the line. And it is not the first time that FNB does not give feedback. I also logged a ***** case in Feb and I never ever received any feedback from FNB on it until I eventually forgot about it.