Affliate and Sales is not tracking

I am one of envato affliate,I makes 3 sales of codecanyon product. But non of any sale is tracked. I tried to contact support many times. but no any reply from affliate network. I cannot understand the reason behind this. I didn’t understand the reason behind this. I talked to more friends who is working of affliate network regarding this. They told me it may not tracked because of many buyers uses browser blocked the tracker. Then Sales is not recorded on that affliate link. But after contacting the brand they manually approved sales. from their sides. But in my case no any sales recoreded and even envato team is approving my sales. I am little confused regarding this. If anyone help me regarding this issue please help me.