my problem bro is with a few clients, I asked for prepayment and suddenly no answer any more, and I make polite way
Yeah but that's the way it goes. If they aren't answering you about prepayment, then it's good thing you didn't begin work because they probably wouldn't pay you in the end. That's happened to me dozens and dozens of times over the years. That's just the way this business works. They probably found someone else or their need for the product fell through, or they were just looking for someone to rip off.
