This is a story about ordinary Australians taking on Australia's biggest bank. It begins with a dying man who believed the Commonwealth Bank wronged him and who was forced into a David and Goliath legal battle in the last six months of his life. This week in a joint Four Corners/Fairfax investigation, reporter Adele Ferguson examines a sales-driven culture inside the Commonwealth Bank's financial planning division that has been described as profit at all cost - a culture that has been built on commissions. The program also looks at the wilful practices of another financial planner, whose annual salary was almost half a million dollars. The CBA protected him until a whistleblower and several of his clients fought back. This story reveals how those customers who believed they were wronged took on both the bank and the corporate regulator, ASIC, and won. There are others who didn't fight and may have lost their life savings Reporter, Adele Ferguson ; presented by Kerry O'Brien.