this is a more common problem than you'd think.

it's not exactly that online gaming is all bad, but definitely you have to stick with reputable sites. online gaming sites are headquarted outside the US, where they can jerk people around and literally steal from them like they did to you, and not have to worry about legal issues.

hate to tell you, but consider yourself fortunate that you even got your $75 back. there's really nothing you can do about this.