OP is simply doing it wrong. Advertising works, and the title's claim only shows how inexperienced op is. I work at a digital ad agency. Ads work if you do it correctly, but it's incredibly easy to waste money. People like op are why google and Facebook make buying ads overly complicated - if it were easy you wouldn't have to spend so much money. If op is reading this, I'd be happy to hop on a phone call and help you…
Buying ads is literally one of the easiest things I've ever done on Facebook.