If ever something needs to be said, it is now. Please don't sit in the front row and whinge about this. Write to ED. You will be referred to HR. Write to them too. Question them regarding the change to your contract, referencing the actual wording in yours. There is no need to be antagonistic. Stick to the facts. Ask to be educated about how this is possible.
What good will this do? Maybe none at all. But print out the paper trail. Print out or copy every bit of correspondence you have with the company regarding contractual issues or changes made to conditions of employment. Keep copies of all your training forms. Especially the good ones!
Maybe one day you have a bad day and are asked to resign. Give that file to a lawyer back home. He might find it interesting reading and enough grounds to hammer in the last nail of a lawsuit against these clowns.