The service agreement needs to be examined verbatim.
What was the ground for creating the service agreement?
Was any extra ordinary favor given, some certified course of training provided that would add to qualification?
Was drafted and signed just to feel obliged since employment is provided? If yes it may get termed as unconscionable/void.
Get into the habit of recording threats (audio/visual/witnessed/minuted) etc.
Now there are many employee's unions in your sector too that have affiliated with trade unions.
United employees can form 'Works Committe' that is an authority as per ID Act, IC's etc......
Do you job advt and Did you mention in job application that you are applying for......................?
if you are being appointed in some dept/div that you do not want resolve amicable by applying your skills.