you should have a try first. that is their fault! ask them to give you a second chance. you can even sue your department secretary in the international student office or some other office in charge of the student affair. talk with your boss and ask for some help. as a boss, he should help you if he is not that mean. if you tried all the above, think about transfering. ask the pros to keep the transfer idea confidential as a favor to you. the kind ones can understand. therefore, it is important to find the kind ones. you know them better. good luck!