scam in money

actually I am student . sometime later I want money for my fee. one day , instagram I saw a I'd . he said that he helped the persons whom is a problem . that's why I am cantact him . and he said gime me 199 for ragistration fee then he gave money but he can't . and then he said pay GST 850 and then he paid. but he never gave the money .I request to all never believed like this I'd