Nedbank ********* banking practice

I purchased a property through Nedbank in 2018, I app**** for a new home and got a call from Nedbank stating that they will give me the home loan on 1 condition, I must move my business accounts back to them. How can you do that? Ethical? When I was with Nedbank Business, I was always risk, always hit with huge interest rates and the service is absolutely pathetic. I was then informed that Nedbank made the rules years ago, why was the rules not followed in 2018 when I accepted my bond through Nedbank? This is not good banking practice at all..