Bad service ever, the worst

A Wesbank customer for years buying a fleet through them paying them off, when the very customer needs finance for an SUV they then demand a deposit of R550k, how ridiculous can this be, speak if good customer relations built over the years. They are a disappointment in the industry. You would have thought some sense holds at Wesbank but seemingly there's none. How do you treat a person who has been faithful to your brand this way?