Co-founder and CTO of HelloSign here. Sorry to hear that OP's bug reports weren't taken seriously. Good tech support is a must for mission critical APIs. At HelloSign we take great pride in our API and our tech support. Rather than outsource support or rely on less technical people, we have our developers directly support the API they built. So when you give our API a try, I encourage you to check in with one of our…
Then you're not paying your developers enough. A developer commands a much larger salary than tech support. You're either underpaying the developers, overpaying techs and calling them developers, or you're not being completely honest in an effort to pull in more customers.
I'd go with 3, but whichever it is, I don't trust anything you've just said.