Actually employees can receive salaries from the company, even if the salary he receives is lower than the others, which makes people move to work usually due to work environment factors that are already uncomfortable, for example companies put pressure so that employees are better resigns.
Salary rates from a company are based on the positions. Obviously high positions like managers can earn more while a common contractual workers can only earn less. Given that they are only contractual, its normal for them be removed by a company after some months no matter what are their performances are. For those who are regular already.
I think the only way for them to get remove is if they done something bad but they can do something like ask their boss to cut their salaries only to remain on their positions because looking for a job right now is also tough. If we are being pressured by our boss then maybe the pay rates that we are getting are also high enough. They have the rights of doing that but quitting isn't the only solution for this.