If HR has ignored your request to mediate the situation and shown no interest in pursuing the problem, here are some steps you can consider:

1. Document the behavior: Keep a record of instances when your colleague makes fun of you and the impact it has on you.

2. Seek support from others: Talk to a trusted friend or family member, or seek support from an employee assistance program or counseling service.

3. Consider finding a new job: If the situation is affecting your well-being and job satisfaction, you may want to consider looking for a new job in a more supportive work environment.

4. Take legal action: If the behavior constitutes harassment, you may want to consult with a lawyer and consider taking legal action.

It's important to remember that your well-being and job satisfaction are important, and you deserve to be treated with respect and dignity in the workplace.
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