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Sorry to hear this.
You may inform your employer that you cannot work with them under the circumstances that you have mentioned.
As the written particulars of the terms and conditions of employment are not agreed, you may stop working immediately if you so wish as once you have worked for a month, you would be obliged to give them at least one week's notice. As you have not yet worked for a month, you may leave immediately, or you may give a week's notice if you so wish.
May I help further?
Obviously the salary would be important.
As you do not know what the updated version is, you cannot be bound by it, but you may look at the original version for guidance although you could argue that you started work subject to contract and therefore are not bound by anything.
All the best