My friend is a psychologist who recently joined a new rehabilitation center in Noida. Upon joining, she received a confirmation email stating her monthly salary as 30k. She began working and received her first salary for 20 days of work. At the end of the second month, she awaited her salary for 20 days but was only given 15k and informed of her termination. No offer letter or terms were provided during her hiring, and she lost her job after a 50-day notice. How can she claim her unpaid salary?