How soon/often to e-mail if you aren't getting credited properly?

[Belle0101]

I keep a log of points earned for each Reward Program I do. I've noticed that a few aren't crediting me for newsletter sign-ups.

So: How soon after the points should be in my acount and they aren't should I e-mail?

How often should I e-mail -- weekly maybe?

At what point do you figure you just aren't going to get your points?

Is it cheating then if you opt-out of the newsletter you didn't get points for and then sign-up for it again later to see if you will get the points for it the next time around?

I understand that there may be situations where the site isn't crediting the program so the program can't credit you. Unfortunately, that's not fair to anybody.

Thanks in advance for your answers!!

~~Belle~~