Sorry that you've had so much difficulty getting them to give you your deserved points. I've always complained to them when I get cut off at or near the end of the survey, and my success rate with getting the points is probably around 85-90%. Every once in a while they do say something like "We're very sorry this happened, and we will share your experience with so-and-so so they can make sure this doesn't happen again," and provide no compensation. But those responses are pretty few and far between, and I can't remember the last time that they failed to respond at all.