In this unpromising situation, the company probably wanted you on board very badly and was willing to say anything to get you to commit. The hope was that once you were on payroll, you would see the company's other wonderful qualities and would think less about broken promises. Of course, the more common reaction is to think less of the company itself.
Companies that engage in deceitful hiring practices run all sorts of risks, such as increased levels of dissatisfaction, distraction, and turnover, and even legal exposure. When companies use an underhanded hiring strategy, employees often respond with their own exit strategy.
At this point, you have nothing to lose by continuing to approach management regarding the unfilled promises. However, rather than repeatedly asking, you may find more success by using more of a sales approach. Let management see the many benefits that will come to them if they keep the commitments. Be sure to phrase such benefits in language that meets their needs, such as in terms of profit, growth, success, and achievement.
If management continues down this road, then perhaps you need to seek a more promising work situation.
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