You could try TapJoy support, but that's like emailing a black hole.

The offers have daily limits, so you might not have gotten credit if you started it before, but finished it after the limit was reached. I'm not sure when TapJoy resets them.

Most of the app downloads are okay, but these insurance ones tend to steal and sell your information. I've always fed them fake info, and they have the same chance of crediting.

Make sure you're accepting cookies, etc. on your browser. That's the only way they can track you to give you credit.