There are two things that you must note: First, if your contract has been registered at the Labour Office. If yes, the contract is a legal document and is binding on both parties. In this case, if there is no such clause in the contract with regards to penalty, then it becomes illegal for the company to penalize you. You can seek assistance from the Human Rights Committee and they will guide you. Take a copy of your contract to them when you go there. You may be advised to seek the assistance of the Labour Office.