Our team leader remains a bully despite our reports. What do we do?

For five years at a large company, we have continually reported the bullying behaviour of our team leader to the department supervisor. She is good for a few days after we report her, then falls back into making us feel an inch tall. HR stepped in once, but the team leader played dumb, as if she didn't know what they were referring to. A few of us have taken stress leave and some have quit. What are our options?

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Bill Howatt, chief research and development officer of work force productivity with Morneau Shepell, provides his insights to the question.