One of my friend is working in a pharma company under outsourcing, at the time of joining he received the appointment letter in which the notice period for resignation was mentioned as one month. later there was change in the company policy thus the notice period was changed to two months. some of his colleagues received the letters regarding the change in the notice period, but my friend did not receive any letter or information regarding the change in the notice period. further the new joining under the same outsourcing contract are receiving the appointment letter with notice period of two months. My friend recently got an offer and he want to get relieved in 30 days, can he get relieved in 30 days? kindly suggest.