No Client service or feedback

I have been a Nedbank business banking client for the past 5 years, I decided to expand my business and apply for R650k loan, I was told that they required 100% security. So I offered my house, 1. the valuation was ridiculous and had to appeal 2. I said lets look at an overdraft as well, there they also require 100% security. my business account has on ave R100 000 flowing in each month. Why do I bank with Nedbank if they are not willing to look at me and my business and take some risk. Added to this I contacted my business banker on the 17/3/2016 already, docs was in by 24/3/2016 after I had to follow up. almost a month later an I am no closer. Does nedbank want my business or should I rather look for other institutions? Clearly they don't appreciated me. My business banker also don't follow up or give email feedback at least, worst of all is the branch manager does not want to field or return my calls. what is going on Nedbank?