I am an employee of a company for morethan 4 years now but i do not have any written contract. everything was verbal including the regularization and they cannot provide me with a contract even if i am requesting for one. Also i haven't gotten an increase in 4 years. my job description, duties and responsibilities kept on changing over the years and now they are again planning on changing my job description to add more task without any increase. My current position is Sales Quality Assurance Officer and they are planning on making me the official company sales trainer without an increase again.
Question is can i refuse to accept the new role? are there any cases that i can file? how can i protect my employment?
Thanks in advance for helping.