Nothing will change until Civil and Criminal consequences apply to Politicians for their actions post said actions.
An Election Promise should have the force of a contract and consequences should follow any breach.
Costings on contracts and the tendering process needs to be open and set in concrete. Undisclosed Mates Deals and unpublished Government Contracts should be outlawed.
Wanting access to a politicians ear shouldn't require a Lobbyist go-between extorting money so as to have that access granted.
Those are just a few of many changes that should be made to Government and the processes that are involved in all forms of Government.