Did not receive invoice and bad behaviour

I applied for internship on 9 October and got selected on 11 October and they gave me target that I have to make 3 enrollments to get eligible for the internship and they are scamming every intern like this. The course they are providing is a total scam. Not satisfied with the courses and they don't even give refund. It's a money waste. When I asked for invoice employee behaved badly. And it's been 2 days now they haven't provide me invoice I have made 4 enrollments in the courses didn't receive even one invoice. I want my money back it's a total scam and I'm not satisfied with they are providing.