The best replacement for grievance is complaint.

The best alternatives to grievance are rated as following:
★★★★★  complaint
★★★  appeal
★  ulp
★  greed
★  dispute
★  gripe
★  disciplinary
★  unfair labor practice
  eeo
  grievance

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Speaking about grievance, one probably shouldn't forget about state bar of texas.

Other search terms related to grievance and their ratings are:
★★★★★ state bar of texas
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Google Trends

Scale is based on the average worldwide traffic of grievance in all years. Click on graph for more.
grievance
complaint
appeal