Unacademy NEET PG - Payment hasn t been made

I was contacted by Unacademy on September **th for their campus Ambassador program by a Person named Tejaswar Dodla to join Unacademy campus Ambassador program. He offered to give free subscription and remuneration in exchange of promoting Unacademy to medical students and conducting free quizzes in their platform. From October *st I started conducting regular quizzes and promoting regularly the Unacademy platform in Telegram, Whatsapp groups and in facebook among my medical friends. For which they said to pay on every **th of the month the remuneration will be processed . ON **th October I did not received any remuneration for any services. After complaining and long waiting I received an invoice of **,*** rupees to be made in my account. But I did not received any money just the invoice I was given after asking for so many times I was told every time to wait another *-* days. And Every time I have asked I have just got excuses.