Civilian staff at Devon and Cornwall Police have been demonstrating at force headquarters in Exeter after a pay review ended with the prospect of hundreds of workers losing up to £8,000 a year.
Workers are demanding an independent investigation into the review – which cost £150,000 – and a pledge of no more reviews of pay.
The chief constable has already apologised to staff for the way in which the review took place, but she has rejected calls to resign.
On Friday, the force said staff would keep their wage levels and those offered rises would keep them.
But many workers are still unhappy with the process and want it scrapped.
Staff want written guarantees that they will not lose money, a scrapping of the pay evaluation which led to the dispute, and an independent inquiry into the way the review was handled.
Assistant chief constable Caroline Winter said: “There were quite a lot of disparities that had to be put right.
“All organisations have to review how they pay their staff. We will learn from this and make sure that whatever happens in the future will take place in a much better way.”
The GMB is holding a meeting of members today to consider the possibility of taking industrial action.