for a while I have a problem with the VSAT, every time I throw and when I die stop giving me VSAT assists, as if it weren't mine, I've talked to more people and they told me that they do not spend it, someone can help me?
You only get the assist points in the life that you activate it. If you die you do not continue to get assist points. So don't call it in if you know that you are about to die.
However, there are a few exceptions like Hell Storm & Lightning Strike where you get Afterlife points, and maybe a few others. In any case after you're dead starting from 0 points.
Not just with the VSAT whenever I get Counter-UAV when I active it noting happens not even the message Counter-UAV actived and I don't get assist too.
Pretty much any non-lethal scorestreak isn't going to give you Afterlife points, but sure it's 'active' for whatever defined period of time per scorestreak.