Salary deduct employee not following contract agreement

Hello can i ask if the employer has the right to force me to live in their accommodation? Upon interview we agreed to live out set up and job offer contract indicate housing and transportation allowance but when I came to qatar and work the first salary was deducted the amount of Transportation and accommodation.
They must've revise the contract without my knowledge and now they are force me to live in the company accomodation.
I need to know my right about this too is it possible for me to fight for what I signed on the contract than what they ask me to do?
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