Another Frustrating experience with FNB

I have been a client with FNB for over 25 years and each time I have to do new business with the bank I'm forced to ask myself why do I keep doing this to myself. The bank calls me monthly to ask me to upgrade to private clients but I am yet to see what I would be paying for with such poor service as the benchmark. We put in a home loan application in December 2018 and after following up relentlessly we received a provisional approval pending certain conditions being met in mid January. It has taken the bank 4 weeks since then to come back with even more documentation which they require. We are now 8 weeks into an application and still there is no finalisation. The sales consultant working on this application is mediocre at best and never returns a call or barely responds to an email with more than it's with the credit department. Wow is this world class private clients banking standards? This has now delayed my project considerably. It is amazing that short of putting a formal complaint in writing a FNB customer will not he attended to. So here goes. FNB needs to be careful as in this day and age young middle class people won't continue wasting their energy on a bank who does not respect their clients' time. I'm hoping to hear shortly from someone who will eventually escalate my issue because I have published a complaint.