Lack of Client Service

I have been with Nedbank for over 10 years, and am most disgruntled with the service that I am receiving as a Private Banking client. I requested an extension of my overdraft facility and was denied a month ago, due to affordability, even though I sent through the Experian communication to explain the error, then I asked for access to my home-loan access amount and was asked again for a stack of documentation, which i responded that the banker had seeing as how there was no change since my last completing them a month ago. Thereafter I received nothing. This is now almost 2 weeks, with no communication forthcoming. I find that this is atrocious service to a very loyal client. Disgusted !!!!